Whey Vs Soy and CHO on body comp

[WillBrink]

This is an important study showing whey superior to soy for altering body comp in ivivo in over weight humans (vs rats, etc) and adds to the pile of studies generally showing whey a superior source of protein with a wide range of benefits.

J Nutr. 2011 August; 141(8): 1489–1494.

Whey Protein but Not Soy Protein Supplementation Alters Body Weight and Composition in Free-Living Overweight and Obese Adults


Abstract

A double-blind, randomized clinical trial was conducted to determine the effect of consumption of supplemental whey protein (WP), soy protein (SP), and an isoenergetic amount of carbohydrate (CHO) on body weight and composition in free-living overweight and obese but otherwise healthy participants. Ninety overweight and obese participants were randomly assigned to 1 of 3 treatment groups for 23 wk: 1) WP; 2) SP (each providing ~56 g/d of protein and 1670 kJ/d); or 3) an isoenergetic amount of CHO. Supplements were consumed as a beverage twice daily. Participants were provided no dietary advice and continued to consume their free-choice diets.

Participants’ body weight and composition data were obtained monthly. Dietary intake was determined by 24-h dietary recalls collected every 10 d. After 23 wk, body weight and composition did not differ between the groups consuming the SP and WP or between SP and CHO; however, body weight and fat mass of the group consuming the WP were lower by 1.8 kg (P < 0.006) and 2.3 kg (P < 0.005), respectively, than the group consuming CHO. Lean body mass did not differ among any of the groups. Waist circumference was smaller in the participants consuming WP than in the other groups (P < 0.05). Fasting ghrelin was lower in participants consuming WP compared with SP or CHO.

Through yet-unknown mechanisms, different sources of dietary protein may differentially facilitate weight loss and affect body composition. Dietary recommendations, especially those that emphasize the role of dietary protein in facilitating weight change, should also address the demonstrated clinical potential of supplemental WP.

Source:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3145217/

[SteveS]

Soy has estrogenic properties. Besides most soy is GMO for people who are concerned with their health.

[WillBrink]

Soy has estrogenic properties. Besides most soy is GMO for people who are concerned with their health.

Personally, wouldn't sweat moderate amounts of soy in the diet, but there's just better choices for protein sources. I see no reason to bother with it either, but don't worry at about some tofu in a dish, etc.

[Vic303]

Besides, some of us enjoy our phytoestrogens!