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ORIGINAL RESEARCH COMMUNICATION |
1 From the Departments of Nutrition (EL-G, MBS, and FBH) and Epidemiology (JEM and FBH), Harvard School of Public Health, Boston; the Channing Laboratory (JEM and FBH) and the Division of Preventive Medicine (JEM), Harvard Medical School, Boston; the Program in Nutrition, Simmons College, Boston (TTF); the Department of Medicine, Harvard Medical School, and the General Medicine Division, Department of Medicine, Massachusetts General Hospital, Boston (JBM); and the Department of Laboratory Medicine, Children's Hospital, and Department of Pathology, Harvard Medical School, Boston (NR).
2 Supported by NIH research grants CA87969, DK55523, and DK58845. EL-G is supported by a fellowship from the Secretaria de Estado de Educacion y Universidades (Ministerio de Educacion y Cultura de España) and Fondo Social Europeo. FBH is partially supported by an American Heart Association Established Investigator Award. JBM is supported by an American Diabetes Association Career Development Award. 3 Address reprint requests to E Lopez-Garcia, Department of Nutrition, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115. E-mail: elopezga{at}hsph.harvard.edu.
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ABSTRACT |
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 TOP ABSTRACT INTRODUCTIONSUBJECTS AND METHODSRESULTSDISCUSSIONREFERENCES |
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Objective: We evaluated the hypothesis that dietary patterns (summary measures of food consumption) are directly associated with markers of inflammation and endothelial dysfunction, particularly C-reactive protein (CRP), interleukin 6, E-selectin, soluble intercellular adhesion molecule 1 (sICAM-1), and soluble vascular cell adhesion molecule 1 (sVCAM-1).
Design: We conducted a cross-sectional study of 732 women from the Nurses' Health Study I cohort who were 43-69 y of age and free of cardiovascular disease, cancer, and diabetes mellitus at the time of blood drawing in 1990. Dietary intake was documented by using a validated food-frequency questionnaire in 1986 and 1990. Dietary patterns were generated by using factor analysis.
Results: A prudent pattern was characterized by higher intakes of fruit, vegetables, legumes, fish, poultry, and whole grains, and a Western pattern was characterized by higher intakes of red and processed meats, sweets, desserts, French fries, and refined grains. The prudent pattern was inversely associated with plasma concentrations of CRP (P = 0.02) and E-selectin (P = 0.001) after adjustment for age, body mass index (BMI), physical activity, smoking status, and alcohol consumption. The Western pattern showed a positive relation with CRP (P < 0.001), interleukin 6 (P = 0.006), E-selectin (P < 0.001), sICAM-1 (P < 0.001), and sVCAM-1 (P = 0.008) after adjustment for all confounders except BMI; with further adjustment for BMI, the coefficients remained significant for CRP (P = 0.02), E-selectin (P < 0.001), sICAM-1 (P = 0.002), and sVCAM-1 (P = 0.02).
Conclusion: Because endothelial dysfunction is an early step in the development of atherosclerosis, this study suggests a mechanism for the role of dietary patterns in the pathogenesis of cardiovascular disease.
Key Words: Dietary patterns • inflammation • endothelial dysfunction • women • C-reactive protein
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INTRODUCTION |
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TOPABSTRACTINTRODUCTIONSUBJECTS AND METHODSRESULTSDISCUSSIONREFERENCES |
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The application of dietary patterns has recently become of considerable interest in nutritional epidemiology (6-8). Major dietary patterns, as summary variables of dietary intake, have been related to CVD risk in general populations (9-12). Furthermore, dietary patterns have shown a relation to some plasma markers of CVD risk and metabolic syndrome (13-15), such as plasma lipids, thrombogenic factors, and glycemic indicators. Except for C-reactive protein (CRP) (13), we are unaware of a relation between dietary patterns and plasma markers of inflammation and endothelial dysfunction. In this study, we evaluated whether dietary patterns derived from factor analysis were directly associated with markers of inflammation and endothelial dysfunction, including CRP, interleukin-6 (IL-6), E-selectin, soluble intercellular adhesion molecule 1 (sICAM-1), and soluble vascular cell adhesion molecule 1 (sVCAM-1).
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SUBJECTS AND METHODS |
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TOPABSTRACTINTRODUCTIONSUBJECTS AND METHODSRESULTSDISCUSSIONREFERENCES |
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Blood collection and assessment of biomarkers
Blood was collected between 1989 and 1990. Women who were willing to provide blood specimens were sent instructions and a phlebotomy kit. Blood specimens were returned by overnight mail on ice, and 97% arrived within 26 h of phlebotomy. The samples were centrifuged (1200 x g, 15 min, room temperature) on arrival to separate plasma from buffy coat and red blood cells and were frozen in liquid nitrogen until analysis. Quality-control samples were routinely frozen along with study samples to monitor plasma changes due to long-term storage and to monitor changes in assay variability. Study samples were analyzed in randomly ordered case-control pairs to further reduce systematic bias and interassay variation.
All markers were measured in the Clinical Chemistry Laboratory at Children's Hospital in Boston. CRP concentrations were measured by using a latex-enhanced turbidimetric assay on a Hitachi 911 (Denka Seiken, Tokyo). IL-6 concentrations were measured by using an ultrasensitive enzyme-linked immunosorbent assay from R & D Systems (Minneapolis). Concentrations of E-selectin, sICAM-1, and sVCAM-1 were measured by using a commercial enzyme-linked immunosorbent assay (R&D Systems). The interassay CVs for the biomarkers were as follows: CRP, 3.4-3.8%; IL-6, 5.8-8.2%; E-selectin, 6.4-6.6%; sICAM-1, 6.1-10.1%; sVCAM-1, 8.5-10.2%.
Assessment of dietary intake
In 1986 and 1990, a semiquantitative food-frequency questionnaire (FFQ) was mailed to participants. The FFQ included questions on 116 food items with specified serving sizes that were described by using natural portions or standard weight and volume measures of servings commonly consumed in this study population. For each food item, participants indicated their average frequency of consumption over the past year in terms of the specified serving size by checking 1 of 9 frequency categories, which ranged from "almost never" to "
6 times/d." The selected frequency category for each food item was converted to a value in number of servings per day. The reproducibility and validity of the FFQ used in this study has been reported elsewhere (16). We aggregated single food items into 37 predefined food groups to minimize within-person variation in consumption of individual foods. Individual food items were preserved if they constituted distinct items on their own (eg, eggs, butter, margarine, pizza, soup, coffee, and tea) or if they were thought to represent particular dietary habits (eg, liquor, wine, beer, and French fries) (Appendix A
). We calculated the averages of food or food groups in 1986 and 1990 to represent long-term dietary patterns and to reduce measurement error in the case of women who provided such information in both years (n = 651); for those who did not, we used the food consumption data reported on either the 1986 or the 1990 FFQ.
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Statistical analysis
The procedure for deriving dietary patterns by using food-consumption data from the FFQ has been described in detail elsewhere (18). We conducted principal component analysis to derive dietary patterns based on food groups (19). The factors were rotated by an orthogonal transformation, which maintains uncorrelated factors and achieves a simpler structure with greater interpretability. To determine the number of factors to be retained, we considered the criterion of an eigenvalue >1, the Scree test (20), and the interpretability of the factors. We did not use the percentage of variance explained by each factor because this criterion depends largely on the total number of variables included in the analyses (20). The factor score for each pattern was constructed by summing observed intakes of the component food items weighted by factor loadings, so each woman received a factor score for each identified pattern (20). The analyses were conducted with the use of the PROC FACTOR procedure in SAS (21). We derived the dietary patterns by using the FFQ administered in 1986, the FFQ administered in 1990, and the average of the 2 FFQs, respectively.
We used PROC GLM to calculate means and CIs for the markers in each quintile of the patterns. We used the log-transformed markers as the dependent variable and the score for each pattern categorized in quintiles as the independent variable. Then we calculated the exponential values of the means and the CIs to obtain the means for the markers.
Multiple linear regressions were used to assess the relation between plasma concentrations of endothelial markers and dietary patterns. We used log-transformed plasma concentrations of biomarkers to achieve normal distributions. First, we adjusted for age (
45, 46-50, 51-55, 56-60, 61-65, 66 y), physical activity (<1.5, 1.5-5.9, 6.0-11.9, 12.0-20.9, 21.0 metabolic equivalent h/wk), smoking status (never; past; current, 1-14 cigarettes/d; current, 15 cigarettes/d), and alcohol consumption (nondrinker, 0-4.9, 5.0-10.0, >10.0 g/d) but not for BMI because it might be an intermediate factor in the causal pathway between dietary patterns and CVD. In an additional analysis, we also adjusted for BMI (<23.0, 23.0-24.9, 25.0-29.9, 30.0-34.9, 35.0).
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RESULTS |
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TOPABSTRACTINTRODUCTIONSUBJECTS AND METHODSRESULTSDISCUSSIONREFERENCES |
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). The prudent pattern was characterized by higher intakes of vegetables, fruit, legumes, whole grains, fish, and poultry, whereas the Western pattern was characterized by higher intakes of red meat, processed meat, refined grains, sweets, desserts, French fries, and high-fat dairy products.
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). In addition, the subjects in the higher quintiles of the prudent pattern had lower intakes of saturated fat and trans fatty acids but higher intakes of polyunsaturated fat, folate, and fiber (P for trend was significant for all). In contrast, in comparison with the subjects in the lowest quintile of the Western pattern, those in the higher quintiles had higher BMI (P for trend < 0.001), were more likely to smoke (P = 0.006), and were less likely to exercise (P = 0.04). Furthermore, the subjects in the higher quintiles of the Western pattern had higher intakes of saturated fat and trans fatty acids but lower intakes of folate and fiber (P for trend was significant for all).
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). Age-adjusted geometric mean plasma concentrations of CRP and E-selectin showed significant decreasing trends with increasing quintiles of the prudent pattern (P for trend of medians: 0.05 for CRP and < 0.001 for E-selectin) (Table 4). In contrast, CRP, E-selectin, sICAM-1, and sVCAM-1 showed increasing trends with increasing quintiles of the Western pattern (P for trend of medians: 0.04 for CRP, 0.02 for E-selectin, 0.008 for sICAM-1, and 0.04 for sVCAM).
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. We chose the average food-consumption values because they reflect maintained habits during the time. The prudent pattern was inversely related to plasma concentrations of CRP (P = 0.02) and E-selectin (P = 0.001) after adjustment for age, BMI, physical activity, smoking status, and average alcohol consumption. We did not see important differences between the ß coefficients before and after adjustment for BMI. The Western pattern showed a positive relation with CRP (P < 0.001), IL-6 (P = 0.006), E-selectin (P < 0.001), sICAM-1 (P < 0.001), and sVCAM-1 (P = 0.008) after adjustment for all confounders except BMI; with adjustment for BMI, the ß coefficients for CRP (P = 0.02), E-selectin (P < 0.001), sICAM (0.002), and sVCAM-1 (P = 0.02) remained significant. Additional adjustment for energy intake, fasting status, aspirin use, and use of hormone replacement therapy did not modify the associations.
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DISCUSSION |
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TOPABSTRACTINTRODUCTIONSUBJECTS AND METHODSRESULTSDISCUSSIONREFERENCES |
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CRP and IL-6 are markers of systemic inflammation and independent predictors of CVD in healthy women (4). Recent data suggest that CRP plays an active role in atherogenesis (22). E-selectin, sICAM-1, and sVCAM-1 are markers of endothelial dysfunction that are detectable in the circulation. Higher concentrations of E-selectin and sICAM-1 have been observed in patients with ischemic heart disease (23), and baseline plasma concentrations of sICAM-1 are predictors of myocardial infarction in apparently healthy men (24). sVCAM-1 is mainly expressed in atherosclerotic plaques and is considered a marker of advanced atherosclerosis (25). Therefore, our findings relating dietary patterns to CRP, E-selectin, sICAM-1, and sVCAM-1 might reflect a potential pathway to CVD.
Diets that are high in fruit, vegetables, antioxidant vitamins, folic acid, and n–3 fatty acids appear to have at least 2 beneficial effects on vascular endothelial function: 1) they decrease endothelial activation, and 2) they improve endothelium-dependent vasodilation (3). In contrast, diets that are high in trans fatty acids may impair endothelial function (26). Our study is consistent with the above evidence because the prudent pattern reflects a high consumption of fruit (source of antioxidant vitamins), vegetables (source of folic acid), and fish (source of n–3 fatty acids), whereas the Western pattern reflects a high consumption of margarine, commercially baked products, and deep-fried fast food (sources of trans fatty acids). Moreover, a prudent dietary pattern was associated with lower CRP concentrations in a study of male health professionals (13).
Insulin resistance syndrome and obesity are closely linked to atherosclerosis and may enhance the inflammatory process present in all stages of atherosclerosis (27). Hyperglycemia associated with insulin resistance can lead to modification of macromolecules as advanced glycation end products that bind surface receptors, which augment the production of proinflammatory cytokines in vascular endothelial cells. Elevated concentrations of CRP and IL-6 have been shown to predict the development of type 2 diabetes mellitus (5). In addition, adipose tissue secretes cytokines, which stimulate the production of acute phase proteins such as CRP. Several cross-sectional studies found a relation between obesity and markers of inflammation and endothelial activation (28-30). In our analysis, dietary patterns were associated with plasma biomarkers of inflammation and endothelial dysfunction after exclusion of subjects with diabetes mellitus and after control for BMI, which suggests that the effect of diet on the development of atherosclerosis is not fully mediated through the development of diabetes and obesity.
The ß coefficients for the relation between the patterns and the markers were low because we used log-transformed concentrations of the markers. We found differences as large as 32 units between quintiles 1 and 5 of the prudent pattern for sVCAM-1. However, the cumulative effects on multiple biomarkers are likely to be much greater than the effect on a single marker.
This study had some limitations. First, it was cross-sectional, so we cannot infer causality from our results, although we can assume a certain directionality because some dietary information was collected 4 y before the blood draw. Second, there was some degree of error in the measurement of food consumption. However, the use of the repeated measurement enabled us to reduce within-person random error. Third, the factor analysis approach involved several arbitrary but important decisions, including the consolidation of food items into food groups, the number of factors to be extracted, the method of rotation, and the labeling of the components (6). However, our 2 main patterns have been used in previous studies in men and women, and these patterns have been shown to predict the risks of CVD and other chronic diseases (9, 11, 13, 31). Finally, dietary patterns may differ by sex, race, cultural group, and geographical region; thus, our study population of US women, most of whom were white and had a comparatively high educational level, may not be generalizable to other populations. However, similar patterns have been identified in nationally representative samples (32).
In conclusion, the present study supports the hypothesis that major dietary patterns are associated with markers of inflammation and endothelial dysfunction. Our findings suggest that one mechanism underlying the relation between diet and CVD may involve influencing the process of systemic inflammation and endothelial dysfunction.
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ACKNOWLEDGMENTS |
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REFERENCES |
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TOPABSTRACTINTRODUCTIONSUBJECTS AND METHODSRESULTSDISCUSSIONREFERENCES |
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S. Desroches, W. R. Archer, M.-E. Paradis, O. Deriaz, P. Couture, J. Bergeron, N. Bergeron, and B. Lamarche Baseline Plasma C-Reactive Protein Concentrations Influence Lipid and Lipoprotein Responses to Low-Fat and High Monounsaturated Fatty Acid Diets in Healthy Men J. Nutr., April 1, 2006; 136(4): 1005 - 1011. [Abstract] [Full Text] [PDF]
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 L. M. Butler, W.-P. Koh, H.-P. Lee, M. Tseng, M. C. Yu, and S. J. London Prospective Study of Dietary Patterns and Persistent Cough with Phlegm among Chinese Singaporeans Am. J. Respir. Crit. Care Med., February 1, 2006; 173(3): 264 - 270. [Abstract] [Full Text] [PDF]
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A. L. Ray, R. D. Semba, J. Walston, L. Ferrucci, A. R. Cappola, M. O. Ricks, Q.-L. Xue, and L. P. Fried Low Serum Selenium and Total Carotenoids Predict Mortality among Older Women Living in the Community: The Women's Health and Aging Studies J. Nutr., January 1, 2006; 136(1): 172 - 176. [Abstract] [Full Text] [PDF]
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 C. H. Kroenke, T. T. Fung, F. B. Hu, and M. D. Holmes Dietary Patterns and Survival After Breast Cancer Diagnosis J. Clin. Oncol., December 20, 2005; 23(36): 9295 - 9303. [Abstract] [Full Text] [PDF]
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B. Watzl, S. E Kulling, J. Moseneder, S. W Barth, and A. Bub A 4-wk intervention with high intake of carotenoid-rich vegetables and fruit reduces plasma C-reactive protein in healthy, nonsmoking men Am. J. Clinical Nutrition, November 1, 2005; 82(5): 1052 - 1058. [Abstract] [Full Text] [PDF]
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 J. M Battershill The Multiple Chemicals and Actions Model of carcinogenesis. A possible new approach to developing prevention strategies for environmental carcinogenesis Human and Experimental Toxicology, November 1, 2005; 24(11): 547 - 558. [Abstract] [PDF]
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M. B Schulze, K. Hoffmann, J. E Manson, W. C Willett, J. B Meigs, C. Weikert, C. Heidemann, G. A Colditz, and F. B Hu Dietary pattern, inflammation, and incidence of type 2 diabetes in women Am. J. Clinical Nutrition, September 1, 2005; 82(3): 675 - 684. [Abstract] [Full Text] [PDF]
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 C. S. Mantzoros, T. Li, J. E. Manson, J. B. Meigs, and F. B. Hu Circulating Adiponectin Levels Are Associated with Better Glycemic Control, More Favorable Lipid Profile, and Reduced Inflammation in Women with Type 2 Diabetes J. Clin. Endocrinol. Metab., August 1, 2005; 90(8): 4542 - 4548. [Abstract] [Full Text] [PDF]
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