SuppVersity - Nutrition and Exercise Science for Everyone: Only Whey, Not Soy Works 'Wheytloss Wonders': Add....: If you want weight loss support, chose the "Wheytloss Wonder" whey concentrate over the allegedly "healthy plant proteins...
Bottom line: The study at hand is only one out of many 
experimental
trials which refute the notion that plant proteins are healthier and 
eating plant instead of protein from animal sources would help you lose 
weight and improve your body composition. The latter is a myth that's 
based on questionable epidemiological data, where confounding factors 
such as the "pizza salami = meat" factor (i.e. the way the meat intake 
is estimate) are hard to control.
Since I hope that we all put more faith in hard experimental vs. "soft" 
epidemiological data, it should be obvious that anyone (including your 
vegan friends) who is planning to lose body fat and improve his / her 
body composition is much better off with whey vs. soy protein; and that 
not just as a replacement for a complete meal, but rather as an addition
that increases the total protein content of the diet and reduces the 
food and energy intake on ad-libitum meals, when the shake is consumed 
30 minutes before a meal | 
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Reference:
- Tahavorgar, Atefeh, et al. "Whey protein preloads are 
more beneficial than soy protein preloads in regulating appetite, 
calorie intake, anthropometry, and body composition of overweight and 
obese men." Nutrition Research (2014).