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American Journal of Clinical Nutrition, Vol 54, 814-820, Copyright © 1991 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Dietary carnitine effects on carnitine concentrations in urine and milk in lactating women

ME Mitchell and EA Snyder
Department of Food Science and Human Nutrition, Washington State University, Pullman 99164-6376.

The effect of dietary carnitine on urinary excretion of free and total carnitine and on breast-milk secretion of the carnitine fractions in 15 control and 16 lactating women aged 21-40 y was measured. Free and total carnitine excretions, obtained from 24-h urine collections, correlated with carnitine consumed on the collection day (P less than 0.03, P less than 0.01, respectively) but not with the mean intake calculated from 3-d diet records. The immediate responses of the control and lactating groups were not significantly different. Urinary excretion of carnitine (n = 31) was 82 +/- 13 mumol/d for free excretion and 226 +/- 22 mumol/d for total excretion. Milk free, acid- soluble acyl-, acid-insoluble acyl-, or total carnitine did not correlate with dietary carnitine or with the duration of lactation (1- 10 mo). Milk total carnitine was 45 +/- 3 mumol/L. With the carnitine content of breast milk remaining stable for greater than or equal to 10 mo, the importance of exogenous carnitine throughout infancy is suggested.




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Copyright © 1991 by The American Society for Nutrition