Vegetable Protein Associated with Lower Body Weight
A study was published in the Journal of the American Dietetic Association’s August issue doing an analysis of protein and weight gain. The odd thing about it was that they used data from a cohort of male employees of the Chicago Western Electric Company — from the 1950s!
In any case, they found that, after 7 years of follow-up, animal protein intake was associated with being overweight and obese, but vegetable protein was the opposite — inversely associated with being overweight. This would be a no-brainer except that they found this independent of calories, fat, and carbohydrate. The findings were highly significant.
The researchers theorized that the different amino acid composition of the animal vs. vegetable protein could account for the difference.
It would have been interesting to see a cohort study done like this in which fat-free mass was included as a variable. In other words, did the people eating more animal protein have a higher muscle mass leading to a higher body mass index (the measure of overweight and obesity)? But even if it did, I’d be surprised if it could make up for the high level of statistical significance. Further research is needed!
Bujnowski D, Xun P, Daviglus ML, Van Horn L, He K, Stamler J. Longitudinal Association between Animal and Vegetable Protein Intake and Obesity among Men in the United States: The Chicago Western Electric Study. J Am Diet Assoc. 2011 Aug;111(8):1150-1155. (Abstract)