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American Journal of Clinical Nutrition, Vol. 80, No. 4, 1089-1090, October 2004
© 2004 American Society for Clinical Nutrition

LETTERS TO THE EDITOR

Reply to T Okada

Hope Weiler

University of Manitoba
Department of Human Nutritional Sciences
Winnipeg
MB R3T 2N2
Canada
E-mail: hweiler{at}ms.umanitoba.ca

Dear Sir:

Milk consumption by children is associated with height and bone mass. In my laboratory, we have focused on the bone-enhancing role of long-chain polyunsaturated fatty acids that are suitable for incorporation into infant formulas. Okada's letter to the Editor cites our recent work (1) conducted in a piglet model of infant nutrition in which we fed isocaloric formulas with varied amounts of arachidonic acid (AA) and docosahexaenoic acid (DHA). We observed higher bone mass with a ratio of AA to DHA of 0.6:0.1 than with lower ratios. No change in growth was observed, and the volume of formula consumed did not differ between the study groups.

We studied a formula composed of skim milk, whey protein, a fat blend plus vitamins and minerals, and the supplemental AA and DHA that had a very different nutrient composition than that of commercially available pasteurized cow milk. Thus, the questions of whether consumption of cow milk enhances bone mass and height in children and what the potential causative mechanisms are cannot be answered by our research. Nonetheless, the observation that AA status was positively associated with higher bone mass, insulin like growth factor I, and calcitriol might provide support for exploring the mechanisms behind observations of enhanced bone mass in children who drink the recommended amount of milk.

REFERENCE

  1. Blanaru JL, Kohut JR, Fitzpatrick-Wong SC, Weiler HA. Dose response of bone mass to dietary arachidonic acid in piglets fed cow milk–based formula. Am J Clin Nutr 2004;79:139–47.[Abstract/Free Full Text]




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