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Effect of a Daily Supplement of Soy Protein on Body Composition and Insulin Secretion in Postmenopausal Women

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Journal Fertil Steril
Date 2007 Apr 7
PMID 17412329
Citations 22
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Abstract

Objective: To determine whether a supplement of soy protein improves body composition, body fat distribution, and glucose and insulin metabolism in postmenopausal women without diabetes compared with an isocaloric casein placebo.

Design: Randomized, double-blind, placebo-controlled 3-month trial.

Setting: Clinical Research Center.

Patient(s): Fifteen postmenopausal women.

Intervention(s): Computed tomographic scans at L4/L5, dual energy x-ray absorptiometry, hyperglycemic clamps.

Main Outcome Measure(s): Total fat, total abdominal fat, visceral fat, subcutaneous abdominal fat, and insulin secretion.

Result(s): Weight by dual energy x-ray absorptiometry did not change between groups (+1.38 +/- 2.02 kg for placebo vs. +0.756 +/- 1.32 kg for soy, mean +/- SD). Total and subcutaneous abdominal fat increased more in the placebo group than in the soy group (for differences between groups in total abdominal fat: +38.62 +/- 22.84 cm(2) for placebo vs. -11.86 +/- 31.48 cm(2) for soy; subcutaneous abdominal fat: +22.91 +/- 28.58 cm(2) for placebo vs. -14.73 +/- 22.26 cm(2) for soy). Insulin secretion, visceral fat, total body fat, and lean mass did not differ between groups. Isoflavone levels increased more in the soy group.

Conclusion(s): A daily supplement of soy protein prevents the increase in subcutaneous and total abdominal fat observed with an isocaloric casein placebo in postmenopausal women.

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