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COMMENTARY |
1 From the Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, LA (GAB), and the Department of Nutrition, University of North Carolina, Chapel Hill (SJN and BMP).
2 Reprints not available. Address correspondence to GA Bray, Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808. E-mail: brayga{at}pbrc.edu
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ABSTRACT |
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 TOP ABSTRACT INTRODUCTIONTHE BIOLOGYHFCS USE AND INTAKEDISCUSSIONREFERENCES |
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2 y, and the top 20% of consumers of caloric sweeteners ingest 316 kcal from HFCS/d. The increased use of HFCS in the United States mirrors the rapid increase in obesity. The digestion, absorption, and metabolism of fructose differ from those of glucose. Hepatic metabolism of fructose favors de novo lipogenesis. In addition, unlike glucose, fructose does not stimulate insulin secretion or enhance leptin production. Because insulin and leptin act as key afferent signals in the regulation of food intake and body weight, this suggests that dietary fructose may contribute to increased energy intake and weight gain. Furthermore, calorically sweetened beverages may enhance caloric overconsumption. Thus, the increase in consumption of HFCS has a temporal relation to the epidemic of obesity, and the overconsumption of HFCS in calorically sweetened beverages may play a role in the epidemic of obesity.
Key Words: Epidemiology • food intake • obesity • artificial sweeteners • fructose
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INTRODUCTION |
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TOPABSTRACTINTRODUCTIONTHE BIOLOGYHFCS USE AND INTAKEDISCUSSIONREFERENCES |
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To provide a common frame of reference for the terms used in this paper, the following definitions should be understood. Sugar is any free monosaccharide or disaccharide present in a food. Sugars includes at least one sugar; composite sugars refers to the aggregate of all forms of sugars in a food and is thus distinguishable from specific types of sugar, such as fructose, glucose, or sucrose. Added sugar is sugar added to a food and includes sweeteners such as sucrose, HFCS, honey, molasses, and other syrups. Naturally occurring sugar is sugar occurring in food and not added in processing, preparation, or at the table. Total sugars represents the total amount of sugars present in a food and includes both naturally occurring and added sugars. Free fructose is fructose that exists in food as the monosaccharide. Fructose refers to both the free and bound forms of fructose (4).
Added sweeteners are important components of our diet, representing 318 kcal of dietary intake for the average American aged 2 y, or 16% of all caloric intake as measured by a nationally representative survey in 1994–1996 (5). Sweet corn-based syrups were developed during the past 3 decades and now represent close to one-half of the caloric sweeteners consumed by Americans (6, 7). HFCS made by enzymatic isomerization of glucose to fructose was introduced as HFCS-42 (42% fructose) and HFCS-55 (55% fructose) in 1967 and 1977, respectively, and opened a new frontier for the sweetener and soft drink industries. Using a glucose isomerase, the starch in corn can be efficiently converted to glucose and then to various amounts of fructose. The hydrolysis of sucrose produces a 50:50 molar mixture of fructose and glucose. The development of these inexpensive, sweet corn-based syrups made it profitable to replace sucrose (sugar) and simple sugars with HFCS in our diet, and they now represent 40% of all added caloric sweeteners (8). Fructose is sweeter than sucrose. In comparative studies of sweetness, in which the sweetness of sucrose was set at 100, fructose had a sweetness of 173 and glucose had a sweetness of 74 (9). If the values noted above are applied, HFCS-42 would be 1.16 times as sweet as sucrose, and HFCS-55 would be 1.28 times as sweet as sucrose. This contrasts with the estimates reported by Hanover and White (10). In their study, the sweetness of sucrose was set at 100 as in reference 8. Fructose, however, had a sweetness of only 117, whereas a 50:50 mixture of fructose and sucrose had a sweetness of 128. It is difficult to see why fructose and sucrose combined would be sweeter than either one alone and as sweet as HFCS-55. On the basis of data in Agriculture Handbook no. 8 from the US Department of Agriculture (USDA) (11), a cola beverage in 1963 had 39 kcal/100 g, whereas a cola beverage in 2003 had 41 kcal/100 g. Because the number of calories per 100 g has not changed substantially over the past 40 y, current beverages are probably sweeter, depending on the temperature at which they are served.
HFCS has become a favorite substitute for sucrose in carbonated beverages, baked goods, canned fruits, jams and jellies, and dairy products (10). The major user of HFCS in the world is the United States; however, HFCS is now manufactured and used in many countries throughout the world (7). In the United States, HFCS is the major source of caloric sweeteners in soft drinks and many other sweetened beverages and is also included in numerous other foods; therefore, HFCS constitutes a major source of dietary fructose. Few data are available on foods containing HFCS in countries other than the United States (7).
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THE BIOLOGY |
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Fructose and insulin release
Along with 2 peptides, glucose-dependent insulinotropic polypeptide and glucagon-like peptide-1 released from the gastrointestinal tract, circulating glucose increases insulin release from the pancreas (13, 14). Fructose does not stimulate insulin secretion in vitro, probably because the ß cells of the pancreas lack the fructose transporter Glut-5 (15, 16). Thus, when fructose is given in vivo as part of a mixed meal, the increase in glucose and insulin is much smaller than when a similar amount of glucose is given. However, fructose produces a much larger increase in lactate and a small (1.7%) increase in diet-induced thermogenesis (17), which again suggests that glucose and fructose have different metabolic effects.
Insulin and leptin
Insulin release can modulate food intake by at least 2 mechanisms. First, Schwartz et al (18) have argued that insulin concentrations in the central nervous system have a direct inhibitory effect on food intake. In addition, insulin may modify food intake by its effect on leptin secretion, which is mainly regulated by insulin-induced changes in glucose metabolism in fat cells (19, 20). Insulin increases leptin release (21) with a time delay of several hours. Thus, a low insulin concentration after ingestion of fructose would be associated with lower average leptin concentrations than would be seen after ingestion of glucose. Because leptin inhibits food intake, the lower leptin concentrations induced by fructose would tend to enhance food intake. This is most dramatically illustrated in humans who lack leptin (22, 23). Persons lacking leptin (homozygotes) are massively obese (22), and heterozygotes with low but detectable serum leptin concentrations have increased adiposity (23), which indicates that low leptin concentrations are associated with increased hunger and gains in body fat. Administration of leptin to persons who lack it produces a dramatic decrease in food intake, as expected. Leptin also increases energy expenditure, and during reduced calorie intake, leptin attenuates the decreases in thyroid hormones and 24-h energy expenditure (24). To the extent that fructose increases in the diet, one might expect less insulin secretion and thus less leptin release and a reduction in the inhibitory effect of leptin on food intake, ie, an increase in food intake. This was found in the preliminary studies reported by Teff et al (25). Consumption of high-fructose meals reduced 24-h plasma insulin and leptin concentrations and increased postprandial fasting triacylglycerol concentrations in women but did not suppress circulating ghrelin concentrations.
Fructose and metabolism
The metabolism of fructose differs from that of glucose in several other ways as well (3). Glucose enters cells by a transport mechanism (Glut-4) that is insulin dependent in most tissues. Insulin activates the insulin receptor, which in turn increases the density of glucose transporters on the cell surface and thus facilitates the entry of glucose. Once inside the cell, glucose is phosphorylated by glucokinase to become glucose-6-phosphate, from which the intracellular metabolism of glucose begins. Intracellular enzymes can tightly control conversion of glucose-6-phosphate to the glycerol backbone of triacylglycerols through modulation by phosphofructokinase. In contrast with glucose, fructose enters cells via a Glut-5 transporter that does not depend on insulin. This transporter is absent from pancreatic ß cells and the brain, which indicates limited entry of fructose into these tissues. Glucose provides "satiety" signals to the brain that fructose cannot provide because it is not transported into the brain. Once inside the cell, fructose is phosphorylated to form fructose-1-phosphate (26). In this configuration, fructose is readily cleaved by aldolase to form trioses that are the backbone for phospholipid and triacyglycerol synthesis. Fructose also provides carbon atoms for synthesis of long-chain fatty acids, although in humans, the quantity of these carbon atoms is small. Thus, fructose facilitates the biochemical formation of triacylglycerols more efficiently than does glucose (3). For example, when a diet containing 17% fructose was provided to healthy men and women, the men, but not the women, showed a highly significant increase of 32% in plasma triacylglycerol concentrations (27).
Overconsumption of sweetened beverages
One model for producing obesity in rodents is to provide sweetened (sucrose, maltose, etc) beverages for them to drink (28). In this setting, the desire for the calorically sweetened solution reduces the intake of solid food, but not by enough to prevent a positive caloric balance and the slow development of obesity. Adding the same amount of sucrose or maltose as of a solid in the diet does not produce the same response. Thus, in experimental animals, sweetened beverages appear to enhance caloric consumption.
Fructose and soft drinks
A similar argument about the role of overconsumption of calorically sweetened beverages may apply to humans (29–32). Mattes (29) reported that when humans ingest energy-containing beverages, energy compensation is less precise than when solid foods are ingested. In another study in humans, DiMeglio and Mattes (30) found that when 15 healthy men and women were given a carbohydrate load of 1880 kJ/d (450 kcal/d) as a calorically sweetened soda for 4 wk, they gained significantly more weight than when the same carbohydrate load was given in a solid form as jelly beans. Additional support for our hypothesis that calorically sweetened beverages may contribute to the epidemic of obesity comes from a longitudinal study in adolescents. Ludwig et al (31) showed that in adolescents participating in the Planet Health project, the quantity of sugar-sweetened beverages ingested predicted initial body mass index (BMI; in kg/m2) and gain in BMI during the follow-up period. Raben et al (32) designed a randomized, double-blind study to compare the effect of calorically sweetened beverages with that of diet drinks on weight gain in moderately overweight men and women. This European study found that drinking calorically sweetened beverages resulted in greater weight gain over the 10-wk study than did drinking diet drinks. Compared with the subjects who consumed diet drinks, those who consumed calorically sweetened beverages did not compensate for this consumption by reducing the intake of other beverages and foods and thus gained weight. The beverages in this study were sweetened with sucrose, whereas in the United States almost all calorically sweetened beverages are sweetened with HFCS. Thus, we need a second randomized controlled study that compares sucrose- and HFCS-sweetened beverages. This could establish whether the form of the caloric sweetener played a role in the weight gain observed in the study by Raben et al (32).
The results of the studies by Raben et al (32) and Ludwig et al (31) suggest that the rapid increase in the intake of calorically sweetened soft drinks could be a contributing factor to the epidemic of weight gain. Between 1970, when HFCS was introduced into the marketplace, and 2000, the per capita consumption of HFCS in the United States increased from 0.292 kg · person-1 · y-1 (0.6 lb · person-1 · y-1) to 33.4 kg · person-1 · y-1 (73.5 lb · person-1 · y-1), an increase of > 100-fold (8) (Table 1
). The total consumption of fructose increased nearly 30%. The consumption of free fructose showed a greater increase, which reflected the increasing use of HFCS (Figure 1). During the same interval, the consumption of sucrose decreased nearly 50%, and the intakes of sucrose and HFCS are now nearly identical. Although this shift has clearly led to a major increase in free-fructose consumption, it is unclear how much of the increase in consumption of calorically sweetened soft drinks is a result of the shift to beverages in which one-half of the fructose is free rather than bound with glucose as in sucrose. A recent review described many facets of this issue (3).
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HFCS USE AND INTAKE |
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TOPABSTRACTINTRODUCTIONTHE BIOLOGYHFCS USE AND INTAKEDISCUSSIONREFERENCES |
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) (8). HFCS-42 was initially the only HFCS component, but by the early 1980s, HFCS-55 had become the major source and constituted 61.2% of all HFCS in 2000. These data are based on per capita food disappearance data. In the absence of direct measures of HFCS intake, these data provide the best indirect measure of the HFCS available for consumption in the United States. The data are useful for studying trends but probably overestimate intake patterns. Although it is useful to understand that HFCS intake represents more than two-fifths of the total intake of caloric sweeteners in the United States, it is also important to recognize that the proportion of HFCS in some foods is much higher than that in other foods.
Foods containing HFCS
In the United States, HFCS is found in almost all foods containing caloric sweeteners. These include most soft drinks and fruit drinks, candied fruits and canned fruits, dairy desserts and flavored yogurts, most baked goods, many cereals, and jellies. Over 60% of the calories in apple juice, which is used as the base for many of the fruit drinks, come from fructose, and thus apple juice is another source of fructose in the diet. Lists of HFCS-containing foods can be obtained from organizations concerned with HFCS-related allergies (33). It is clear that almost all caloric sweeteners used by manufacturers of soft drinks and fruit drinks are HFCS (4, 34). In fact, about two-thirds of all HFCS consumed in the United States are in beverages. Aside from beverages, there is no definitive literature on the proportion of caloric sweeteners that is HFCS in other processed foods. HFCS is found in most processed foods; however, the exact compositions are not available from either the manufacturer or any publicly available food-composition table.
Trends in obesity and HFCS availability
There are important similarities between the trend in HFCS availability and the trends in the prevalence of obesity in the United States (Figure 1). Using age-standardized, nationally representative measures of obesity at 5 time points from 1960 to 1999 (35) and data on the availability of HFCS collected annually over this same period, we graphed both patterns. The data on obesity are from the National Center for Health Statistics for the following periods: 1960–1962 (National Health Examination Survey I), 1971–1975 [National Health and Nutrition Examination Survey (NHANES)], 1976–1980 (NHANES II), 1988–1994 (NHANES III), and 1999 (NHANES 1999–2000) (35). The HFCS data are those from Table 1. The prevalence of overweight (BMI of 25–29.9) and the prevalence of obesity (BMI > 30) were fit with fourth-order polynomial curves so that the limited number of data points could be fitted into a curve to capture the US trends. We also included estimates of free-fructose intake and total fructose intake. Total fructose is the sum of free fructose and fructose that is part of the disaccharide sucrose. Free fructose is the monosaccharide in HFCS and is also obtained in small amounts from other sources. Free-fructose intake closely follows the intake of HFCS. Total fructose intake increased nearly 30% between 1970 and 2000.
Estimated HFCS consumption
The intake of caloric sweeteners in the United States has increased rapidly, and nationally representative data from 1994 to 1998 from the USDA allow us to estimate an intake of 318 kcal/d for the average US resident aged 2 y. This value is one-sixth of the intake of all calories and close to one-third of the intake of all carbohydrates and represents a significant increase over the past 2 decades (Table 2). As the intake of caloric sweeteners increased, so did the fructose load, which increased from 158.5 to 228 kcal · person-1 · d-1 between 1977–1978 (36) and 1994–1998 (38, 39).
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, the major increase in the intake of caloric sweeteners from 1977 to 1998 came from the intake of soft drinks and fruit drinks, and these intake values were 105 and 31 kcal · person-1 · d-1, respectively, of the total added sugar intake of 318 kcal · person-1 · d-1 in 1994–1998. Moreover, more than one-half of the increased caloric sweetener intake during this time period came from the intake of these beverages. The intakes of these 2 types of beverages and of desserts total about two-thirds of all caloric sweetener intake in the United States today (Table 2).
We have no way to directly measure total HFCS use. However, one Food and Drug Administration study used very conservative methods to estimate HFCS use for the nationally representative dietary intake sample from 1977 to 1978 from the USDA (35). Using measures of the proportion of HFCS in each food, Glinsmann et al (40) created food category–wide estimates of the proportion of caloric sweeteners that is HFCS. We applied those same proportions to a set of food groups to estimate the use of caloric sweeteners not only during 1977–1978 but also during later periods. Using our conversion technique applied to the initial 1977–1978 Nationwide Food Consumption Survey data, we obtained results that were only 4 kcal higher than the estimates of Glinsmann et al (39). This approach is based on HFCS composition in the early 1980s. With the use of the USDA value of 4.2 g HFCS/tsp (0.84 g/mL), the availability of HFCS in the food supply in the early 1980s was only one-half of the current availability on a gram per capita basis (as shown in Table 1). Thus, we feel confident that we can use this approach to provide a conservative lower limit of HFCS intake.
In Table 2, the 2 columns at the right contain our estimates of HFCS intake and total fructose intake. On the basis of the trend in intakes, our estimate of HFCS intake for the most recent period of measurement from 1994–1998 is 132 kcal · person-1 · d-1 (37). This represents a shift between 1977–1978 and 1994–1998 from 4.5% of total calories to 6.7% of total calories, or from 10.1% of carbohydrates to 13.1% of carbohydrates (41). The estimate of total fructose intake, which was obtained from the intakes of sucrose and HFCS, would be somewhat higher if we knew the fructose content of the fruit drinks.
Distribution of HFCS intake matters!
We also explored the distribution of HFCS consumption by examining quintiles of caloric sweetener intake among Americans aged 2 y (Table 3). Most of the increase in caloric sweetener intake from the middle quintile to the upper quintile came from increases in the intake of calorically sweetened beverages, particularly soft drinks. Consumers in the top quintile, which represents 20% of all Americans, consume > 11% of their calories from HFCS. Again, remember that this is a very conservative estimate. This same group obtains almost one-half of its carbohydrates from caloric sweeteners and one-fifth of its carbohydrates from HFCS.
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DISCUSSION |
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TOPABSTRACTINTRODUCTIONTHE BIOLOGYHFCS USE AND INTAKEDISCUSSIONREFERENCES |
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In this article, we address an important potential hypothesis by which HFCS may have an environmental link with the epidemic of obesity. When total calorie intake is fixed, ie, if a person eats the same amount of fructose, glucose, or sucrose in a metabolically controlled setting, the response should be the same, and this was shown by McDevitt et al (46). This situation is not one in which differences in taste and portion size are allowed to operate. However, many biological factors that we noted in this article suggest that calorically sweetened beverages are associated with overconsumption when the sweetener is in a liquid form (29–32). The collective data suggest that overconsumption of beverages sweetened with HFCS and containing > 50% free fructose and the increased intake of total fructose may play a role in the epidemic of obesity. Whether HFCS used in solid food produces the same overconsumption as it does in beverages is unknown, but we suspect that if the HFCS was entirely in the solid form, it would not pose the same problem (30). Total fructose, both free fructose and fructose combined in sucrose, in both beverages and solid food may be viewed as a precursor to fat because of the ease with which the carbon skeleton of fructose can form the backbone for triacylglycerols and be used for the synthesis of long-chain fatty acids (25). Additional clinical trials are clearly needed to buttress the conclusions of Raben et al (32) that beverages containing sugar caused more weight gain over 10 wk than did diet beverages.
There is a distinct likelihood that the increased consumption of HFCS in beverages may be linked to the increase in obesity. One US study showed that beverages sweetened with HFCS are linked with increased energy intake and weight gain (31). Furthermore, we showed that the increase in the use of HFCS was concurrent with the increase in obesity rates in the United States. HFCS was introduced into the food supply just before 1970 and increased rapidly to constitute > 40% of the sweeteners used by 2000 (8). The increase in HFCS consumption just preceded the rapid increase in the prevalence of obesity that occurred between the National Center for Health Statistics survey in 1976–1980 and the next survey in 1988–1994 (35) (Figure 1).
HFCS is used in soft drinks, and HFCS and apple juice, which has 65% fructose, are used as the principal sweeteners for fruit drinks. The increasing consumption of calorically sweetened soft drinks has been associated with a decrease in the intake of milk (5, 8, 47, 48). This relation adds another mechanism by which HFCS consumption in beverages may be related to the epidemic of obesity. Per capita calcium intake decreased from 890 to 860 mg/d between 1970 and 1981 but has increased slowly since then (8). This was a mean 3% decrease that probably reflected a much larger decrease in calcium intake at the upper ends of the skewed distribution for intake. In US teenagers, total calcium intake decreased by > 50 mg/d (> 10%) between 1977 and 1996 (49). A convincing set of epidemiologic and clinical studies suggests that dairy products may have a favorable effect on body weight and insulin resistance in both children and adults (50–52). During the interval from 1970 to 1990, the intake of whole milk decreased 58%. However, the intake of cheese, which is high in fat, increased and partially offset the decrease in calcium intake from milk (8). Because milk is a major source of dietary calcium for most humans, this decrease in milk intake may play an important role in the decrease in calcium in the diet.
One possible public health option is to address the sweet taste preference of humans by reducing HFCS and, if sweetness is needed, relying on artificial sweeteners to make up any difference in sweetness. It is becoming increasingly clear that soft drink consumption may be an important contributor to the epidemic of obesity, in part through the larger portion sizes of these beverages and through the increased intake of fructose from HFCS and sucrose (53). If HFCS acts as an agent in the disease, then reducing exposure to this agent may help to reduce the epidemic (54).
Some will question our measures of HFCS intake and availability. Our very conservative estimate of HFCS use and the Food and Drug Administration data showed high HFCS intakes for a large segment of the US population (39).
In conclusion, we believe that an argument can now be made that the use of HFCS in beverages should be reduced and that HFCS should be replaced with alternative noncaloric sweeteners. Sweetness is a preferred taste as well as an acquired one that may be enhanced by exposure to sweet foods. The hypothesis that providing sodas and juice drinks in which caloric sweeteners are partially or completely replaced with noncaloric sweeteners will help reduce the prevalence of obesity is worth testing. If the intake of calorically sweetened beverages is contributing to the current epidemic, then reducing the availability of these beverages by removing soda machines from schools would be a strategy worth considering, as would reducing the portion sizes of sodas that are commercially available (55).
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ACKNOWLEDGMENTS |
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G. Livesey and R. Taylor Fructose consumption and consequences for glycation, plasma triacylglycerol, and body weight: meta-analyses and meta-regression models of intervention studies Am. J. Clinical Nutrition, November 1, 2008; 88(5): 1419 - 1437. [Abstract] [Full Text] [PDF]
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A. Shapiro, W. Mu, C. Roncal, K.-Y. Cheng, R. J. Johnson, and P. J. Scarpace Fructose-induced leptin resistance exacerbates weight gain in response to subsequent high-fat feeding Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2008; 295(5): R1370 - R1375. [Abstract] [Full Text] [PDF]
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J. R. Vasselli Fructose-induced leptin resistance: discovery of an unsuspected form of the phenomenon and its significance. Focus on "Fructose-induced leptin resistance exacerbates weight gain in response to subsequent high-fat feeding," by Shapiro et al. Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2008; 295(5): R1365 - R1369. [Full Text] [PDF]
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C. E. Smith, K. L. Tucker, N. Yiannakouris, B. Garcia-Bailo, J. Mattei, C.-Q. Lai, L. D. Parnell, and J. M. Ordovas Perilipin Polymorphism Interacts with Dietary Carbohydrates to Modulate Anthropometric Traits in Hispanics of Caribbean Origin J. Nutr., October 1, 2008; 138(10): 1852 - 1858. [Abstract] [Full Text] [PDF]
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 N. Anderson and J. Borlak Molecular Mechanisms and Therapeutic Targets in Steatosis and Steatohepatitis Pharmacol. Rev., September 1, 2008; 60(3): 311 - 357. [Abstract] [Full Text] [PDF]
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O. Glushakova, T. Kosugi, C. Roncal, W. Mu, M. Heinig, P. Cirillo, L. G. Sanchez-Lozada, R. J. Johnson, and T. Nakagawa Fructose Induces the Inflammatory Molecule ICAM-1 in Endothelial Cells J. Am. Soc. Nephrol., September 1, 2008; 19(9): 1712 - 1720. [Abstract] [Full Text] [PDF]
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 A. Brandstatter, S. Kiechl, B. Kollerits, S. C. Hunt, I. M. Heid, S. Coassin, J. Willeit, T. D. Adams, T. Illig, P. N. Hopkins, et al. Sex-Specific Association of the Putative Fructose Transporter SLC2A9 Variants With Uric Acid Levels Is Modified by BMI Diabetes Care, August 1, 2008; 31(8): 1662 - 1667. [Abstract] [Full Text] [PDF]
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J. R. Palmer, D. A. Boggs, S. Krishnan, F. B. Hu, M. Singer, and L. Rosenberg Sugar-Sweetened Beverages and Incidence of Type 2 Diabetes Mellitus in African American Women Arch Intern Med, July 28, 2008; 168(14): 1487 - 1492. [Abstract] [Full Text] [PDF]
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 S. K. Kumanyika, E. Obarzanek, N. Stettler, R. Bell, A. E. Field, S. P. Fortmann, B. A. Franklin, M. W. Gillman, C. E. Lewis, W. C. Poston II, et al. Population-Based Prevention of Obesity: The Need for Comprehensive Promotion of Healthful Eating, Physical Activity, and Energy Balance: A Scientific Statement From American Heart Association Council on Epidemiology and Prevention, Interdisciplinary Committee for Prevention (Formerly the Expert Panel on Population and Prevention Science) Circulation, July 22, 2008; 118(4): 428 - 464. [Abstract] [Full Text] [PDF]
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 S. H. Adams, K. L. Stanhope, R. W. Grant, B. P. Cummings, and P. J. Havel Metabolic and Endocrine Profiles in Response to Systemic Infusion of Fructose and Glucose in Rhesus Macaques Endocrinology, June 1, 2008; 149(6): 3002 - 3008. [Abstract] [Full Text] [PDF]
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K. L Stanhope, S. C Griffen, B. R Bair, M. M Swarbrick, N. L Keim, and P. J Havel Twenty-four-hour endocrine and metabolic profiles following consumption of high-fructose corn syrup-, sucrose-, fructose-, and glucose-sweetened beverages with meals Am. J. Clinical Nutrition, May 1, 2008; 87(5): 1194 - 1203. [Abstract] [Full Text] [PDF]
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S. Kirchner, A. Muduli, D. Casirola, K. Prum, V. Douard, and R. P Ferraris Luminal fructose inhibits rat intestinal sodium-phosphate cotransporter gene expression and phosphate uptake Am. J. Clinical Nutrition, April 1, 2008; 87(4): 1028 - 1038. [Abstract] [Full Text] [PDF]
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G. A Bray Reply to RJ Hine and JS White Am. J. Clinical Nutrition, April 1, 2008; 87(4): 1064 - 1065. [Full Text] [PDF]
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J. S White No unique role for fructose sweeteners in obesity or cardiorenal disease Am. J. Clinical Nutrition, April 1, 2008; 87(4): 1062 - 1063. [Full Text] [PDF]
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 L. G. Sanchez-Lozada, E. Tapia, P. Bautista-Garcia, V. Soto, C. Avila-Casado, I. P. Vega-Campos, T. Nakagawa, L. Zhao, M. Franco, and R. J. Johnson Effects of febuxostat on metabolic and renal alterations in rats with fructose-induced metabolic syndrome Am J Physiol Renal Physiol, April 1, 2008; 294(4): F710 - F718. [Abstract] [Full Text] [PDF]
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C. M. Brown, A. G. Dulloo, G. Yepuri, and J.-P. Montani Fructose ingestion acutely elevates blood pressure in healthy young humans Am J Physiol Regulatory Integrative Comp Physiol, March 1, 2008; 294(3): R730 - R737. [Abstract] [Full Text] [PDF]
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H. K Choi and G. Curhan Soft drinks, fructose consumption, and the risk of gout in men: prospective cohort study BMJ, February 9, 2008; 336(7639): 309 - 312. [Abstract] [Full Text] [PDF]
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 S. Harrington The Role of Sugar-Sweetened Beverage Consumption in Adolescent Obesity: A Review of the Literature The Journal of School Nursing, February 1, 2008; 24(1): 3 - 12. [Abstract] [Full Text] [PDF]
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 M. C. Cave, R. T. Hurt, T. H. Frazier, P. J. Matheson, R. N. Garrison, C. J. McClain, and S. A. McClave Obesity, Inflammation, and the Potential Application of Pharmaconutrition Nutr Clin Pract, February 1, 2008; 23(1): 16 - 34. [Abstract] [Full Text] [PDF]
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 D. Cao, H. Lu, T. L. Lewis, and L. Li Intake of Sucrose-sweetened Water Induces Insulin Resistance and Exacerbates Memory Deficits and Amyloidosis in a Transgenic Mouse Model of Alzheimer Disease J. Biol. Chem., December 14, 2007; 282(50): 36275 - 36282. [Abstract] [Full Text] [PDF]
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G H. Anderson Much ado about high-fructose corn syrup in beverages: the meat of the matter Am. J. Clinical Nutrition, December 1, 2007; 86(6): 1577 - 1578. [Full Text] [PDF]
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S. Soenen and M. S Westerterp-Plantenga No differences in satiety or energy intake after high-fructose corn syrup, sucrose, or milk preloads Am. J. Clinical Nutrition, December 1, 2007; 86(6): 1586 - 1594. [Abstract] [Full Text] [PDF]
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T. Akhavan and G H. Anderson Effects of glucose-to-fructose ratios in solutions on subjective satiety, food intake, and satiety hormones in young men Am. J. Clinical Nutrition, November 1, 2007; 86(5): 1354 - 1363. [Abstract] [Full Text] [PDF]
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K. Yasuda, R. Maiorano, R. M. Welch, D. D. Miller, and X. G. Lei Cecum Is the Major Degradation Site of Ingested Inulin in Young Pigs J. Nutr., November 1, 2007; 137(11): 2399 - 2404. [Abstract] [Full Text] [PDF]
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G. A Bray How bad is fructose? Am. J. Clinical Nutrition, October 1, 2007; 86(4): 895 - 896. [Full Text] [PDF]
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R. J Johnson, M. S Segal, Y. Sautin, T. Nakagawa, D. I Feig, D.-H. Kang, M. S Gersch, S. Benner, and L. G Sanchez-Lozada Potential role of sugar (fructose) in the epidemic of hypertension, obesity and the metabolic syndrome, diabetes, kidney disease, and cardiovascular disease Am. J. Clinical Nutrition, October 1, 2007; 86(4): 899 - 906. [Abstract] [Full Text] [PDF]
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I. Aeberli, M. B Zimmermann, L. Molinari, R. Lehmann, D. l'Allemand, G. A Spinas, and K. Berneis Fructose intake is a predictor of LDL particle size in overweight schoolchildren Am. J. Clinical Nutrition, October 1, 2007; 86(4): 1174 - 1178. [Abstract] [Full Text] [PDF]
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E. G. Neilson The Fructose Nation J. Am. Soc. Nephrol., October 1, 2007; 18(10): 2619 - 2621. [Full Text] [PDF]
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S. Reungjui, C. A. Roncal, W. Mu, T. R. Srinivas, D. Sirivongs, R. J. Johnson, and T. Nakagawa Thiazide Diuretics Exacerbate Fructose-Induced Metabolic Syndrome J. Am. Soc. Nephrol., October 1, 2007; 18(10): 2724 - 2731. [Abstract] [Full Text] [PDF]
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M. S. Gersch, W. Mu, P. Cirillo, S. Reungjui, L. Zhang, C. Roncal, Y. Y. Sautin, R. J. Johnson, and T. Nakagawa Fructose, but not dextrose, accelerates the progression of chronic kidney disease Am J Physiol Renal Physiol, October 1, 2007; 293(4): F1256 - F1261. [Abstract] [Full Text] [PDF]
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M. Yoshida, N. M. McKeown, G. Rogers, J. B. Meigs, E. Saltzman, R. D'Agostino, and P. F. Jacques Surrogate Markers of Insulin Resistance Are Associated with Consumption of Sugar-Sweetened Drinks and Fruit Juice in Middle and Older-Aged Adults J. Nutr., September 1, 2007; 137(9): 2121 - 2127. [Abstract] [Full Text] [PDF]
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 X. Gao, L. Qi, N. Qiao, H. K. Choi, G. Curhan, K. L. Tucker, and A. Ascherio Intake of Added Sugar and Sugar-Sweetened Drink and Serum Uric Acid Concentration in US Men and Women Hypertension, August 1, 2007; 50(2): 306 - 312. [Abstract] [Full Text] [PDF]
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R. Dhingra, L. Sullivan, P. F. Jacques, T. J. Wang, C. S. Fox, J. B. Meigs, R. B. D'Agostino, J. M. Gaziano, and R. S. Vasan Soft Drink Consumption and Risk of Developing Cardiometabolic Risk Factors and the Metabolic Syndrome in Middle-Aged Adults in the Community Circulation, July 31, 2007; 116(5): 480 - 488. [Abstract] [Full Text] [PDF]
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P. Monsivais, M. M Perrigue, and A. Drewnowski Sugars and satiety: does the type of sweetener make a difference? Am. J. Clinical Nutrition, July 1, 2007; 86(1): 116 - 123. [Abstract] [Full Text] [PDF]
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 D. M. Klohe-Lehman, J. Freeland-Graves, K. K. Clarke, G. Cai, V. S. Voruganti, T. J. Milani, H. J. Nuss, J. M. Proffitt, and T. M. Bohman Low-Income, Overweight and Obese Mothers as Agents of Change to Improve Food Choices, Fat Habits, and Physical Activity in their 1-to-3-Year-Old Children J. Am. Coll. Nutr., June 1, 2007; 26(3): 196 - 208. [Abstract] [Full Text] [PDF]
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 W. Huang, N. Dedousis, and R. M. O'Doherty Hepatic steatosis and plasma dyslipidemia induced by a high-sucrose diet are corrected by an acute leptin infusion J Appl Physiol, June 1, 2007; 102(6): 2260 - 2265. [Abstract] [Full Text] [PDF]
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 L. R. Vartanian, M. B. Schwartz, and K. D. Brownell Effects of Soft Drink Consumption on Nutrition and Health: A Systematic Review and Meta-Analysis Am J Public Health, April 1, 2007; 97(4): 667 - 675. [Abstract] [Full Text] [PDF]
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A. Drewnowski and F. Bellisle Liquid calories, sugar, and body weight Am. J. Clinical Nutrition, March 1, 2007; 85(3): 651 - 661. [Abstract] [Full Text] [PDF]
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A. Bhargava and A. Amialchuk Added Sugars Displaced the Use of Vital Nutrients in the National Food Stamp Program Survey J. Nutr., February 1, 2007; 137(2): 453 - 460. [Abstract] [Full Text] [PDF]
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 N. Sharma, I. C. Okere, M. K. Duda, D. J. Chess, K. M. O'Shea, and W. C. Stanley Potential impact of carbohydrate and fat intake on pathological left ventricular hypertrophy Cardiovasc Res, January 15, 2007; 73(2): 257 - 268. [Abstract] [Full Text] [PDF]
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K.-A. Le, D. Faeh, R. Stettler, M. Ith, R. Kreis, P. Vermathen, C. Boesch, E. Ravussin, and L. Tappy A 4-wk high-fructose diet alters lipid metabolism without affecting insulin sensitivity or ectopic lipids in healthy humans Am. J. Clinical Nutrition, December 1, 2006; 84(6): 1374 - 1379. [Abstract] [Full Text] [PDF]
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J. O. Hill Understanding and Addressing the Epidemic of Obesity: An Energy Balance Perspective Endocr. Rev., December 1, 2006; 27(7): 750 - 761. [Abstract] [Full Text] [PDF]
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 N. P. Paynter, H.-C. Yeh, S. Voutilainen, M. I. Schmidt, G. Heiss, A. R. Folsom, F. L. Brancati, and W. H. L. Kao Coffee and Sweetened Beverage Consumption and the Risk of Type 2 Diabetes Mellitus: The Atherosclerosis Risk in Communities Study Am. J. Epidemiol., December 1, 2006; 164(11): 1075 - 1084. [Abstract] [Full Text] [PDF]
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S. C Larsson, L. Bergkvist, and A. Wolk Consumption of sugar and sugar-sweetened foods and the risk of pancreatic cancer in a prospective study. Am. J. Clinical Nutrition, November 1, 2006; 84(5): 1171 - 1176. [Abstract] [Full Text] [PDF]
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Z. T. Bloomgarden Third Annual World Congress on the Insulin Resistance Syndrome: Associated conditions. Diabetes Care, September 1, 2006; 29(9): 2165 - 2174. [Full Text] [PDF]
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V. S Malik, M. B Schulze, and F. B Hu Intake of sugar-sweetened beverages and weight gain: a systematic review. Am. J. Clinical Nutrition, August 1, 2006; 84(2): 274 - 288. [Abstract] [Full Text] [PDF]
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B. M Popkin Global nutrition dynamics: the world is shifting rapidly toward a diet linked with noncommunicable diseases. Am. J. Clinical Nutrition, August 1, 2006; 84(2): 289 - 298. [Abstract] [Full Text] [PDF]
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B. M Popkin, L. E Armstrong, G. M Bray, B. Caballero, B. Frei, and W. C Willett A new proposed guidance system for beverage consumption in the United States Am. J. Clinical Nutrition, March 1, 2006; 83(3): 529 - 542. [Abstract] [Full Text] [PDF]
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 C. B. Ebbeling, H. A. Feldman, S. K. Osganian, V. R. Chomitz, S. J. Ellenbogen, and D. S. Ludwig Effects of Decreasing Sugar-Sweetened Beverage Consumption on Body Weight in Adolescents: A Randomized, Controlled Pilot Study Pediatrics, March 1, 2006; 117(3): 673 - 680. [Abstract] [Full Text] [PDF]
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T. Nakagawa, H. Hu, S. Zharikov, K. R. Tuttle, R. A. Short, O. Glushakova, X. Ouyang, D. I. Feig, E. R. Block, J. Herrera-Acosta, et al. A causal role for uric acid in fructose-induced metabolic syndrome Am J Physiol Renal Physiol, March 1, 2006; 290(3): F625 - F631. [Abstract] [Full Text] [PDF]
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M. Bes-Rastrollo, A. Sanchez-Villegas, E. Gomez-Gracia, J A. Martinez, R. M Pajares, and M. A Martinez-Gonzalez Predictors of weight gain in a Mediterranean cohort: the Seguimiento Universidad de Navarra Study 1 Am. J. Clinical Nutrition, February 1, 2006; 83(2): 362 - 370. [Abstract] [Full Text] [PDF]
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F. Greenway Virus-induced obesity Am J Physiol Regulatory Integrative Comp Physiol, January 1, 2006; 290(1): R188 - R189. [Full Text] [PDF]
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 H. K. Choi, D. B. Mount, and A. M. Reginato Pathogenesis of Gout Ann Intern Med, October 4, 2005; 143(7): 499 - 516. [Full Text] [PDF]
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A. Drewnowski Concept of a nutritious food: toward a nutrient density score Am. J. Clinical Nutrition, October 1, 2005; 82(4): 721 - 732. [Abstract] [Full Text] [PDF]
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 P Aro, J Ronkainen, N J Talley, T Storskrubb, E Bolling-Sternevald, and L Agreus Body mass index and chronic unexplained gastrointestinal symptoms: an adult endoscopic population based study Gut, October 1, 2005; 54(10): 1377 - 1383. [Abstract] [Full Text] [PDF]
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A. Drewnowski and N. Darmon The economics of obesity: dietary energy density and energy cost Am. J. Clinical Nutrition, July 1, 2005; 82(1): 265S - 273S. [Abstract] [Full Text] [PDF]
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 D. Faeh, K. Minehira, J.-M. Schwarz, R. Periasamy, S. Park, and L. Tappy Effect of Fructose Overfeeding and Fish Oil Administration on Hepatic De Novo Lipogenesis and Insulin Sensitivity in Healthy Men Diabetes, July 1, 2005; 54(7): 1907 - 1913. [Abstract] [Full Text] [PDF]
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Y. Wei, D. Wang, and M. J. Pagliassotti Fructose Selectively Modulates c-jun N-Terminal Kinase Activity and Insulin Signaling in Rat Primary Hepatocytes J. Nutr., July 1, 2005; 135(7): 1642 - 1646. [Abstract] [Full Text] [PDF]
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Z. T. Bloomgarden Second World Congress on the Insulin Resistance Syndrome: Insulin resistance syndrome and nonalcoholic fatty liver disease Diabetes Care, June 1, 2005; 28(6): 1518 - 1523. [Full Text] [PDF]
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 X.-L. Cui, A. M. Schlesier, E. L. Fisher, C. Cerqueira, and R. P. Ferraris Fructose-induced increases in neonatal rat intestinal fructose transport involve the PI3-kinase/Akt signaling pathway Am J Physiol Gastrointest Liver Physiol, June 1, 2005; 288(6): G1310 - G1320. [Abstract] [Full Text] [PDF]
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S. E. la Fleur, H. Houshyar, M. Roy, and M. F. Dallman Choice of Lard, But Not Total Lard Calories, Damps Adrenocorticotropin Responses to Restraint Endocrinology, May 1, 2005; 146(5): 2193 - 2199. [Abstract] [Full Text] [PDF]
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 C. A. Krone and J. T. A. Ely Controlling Hyperglycemia as an Adjunct to Cancer Therapy Integr Cancer Ther, March 1, 2005; 4(1): 25 - 31. [Abstract] [PDF]
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R. F. Kushner Low-Carbohydrate Diets, Con: The Mythical Phoenix or Credible Science? Nutr Clin Pract, February 1, 2005; 20(1): 13 - 16. [Abstract] [Full Text] [PDF]
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G. Bray, S. Nielsen, and B. Popkin Reply to NJ Krilanovich Am. J. Clinical Nutrition, November 1, 2004; 80(5): 1447 - 1448. [Full Text] [PDF]
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N. J Krilanovich Fructose misuse, the obesity epidemic, the special problems of the child, and a call to action Am. J. Clinical Nutrition, November 1, 2004; 80(5): 1446 - 1447. [Full Text] [PDF]
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 Y. Wei and M. J. Pagliassotti Hepatospecific effects of fructose on c-jun NH2-terminal kinase: implications for hepatic insulin resistance Am J Physiol Endocrinol Metab, November 1, 2004; 287(5): E926 - E933. [Abstract] [Full Text] [PDF]
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M. F Jacobson High-fructose corn syrup and the obesity epidemic Am. J. Clinical Nutrition, October 1, 2004; 80(4): 1081 - 1081. [Full Text] [PDF]
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G. A Bray, S. J. Nielsen, and B. M Popkin Reply to MF Jacobson Am. J. Clinical Nutrition, October 1, 2004; 80(4): 1081 - 1082. [Full Text] [PDF]
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), and high-fructose corn syrup (HFCS, 
) in relation to trends in the prevalence of overweight (
) and obesity (x) in the United States. Data from references