5. Vegans Tend to Have Lower BMI What?! Being vegan makes you skinnier? Well basically. Loma Linda University did another study (yes, I referenced them earlier. What do you expect from a vegetarian University?! I say, keep ‘em coming, guys!) that was published in The Journal of the Academy of Nutrition and Dietetics study. It’s based on data from the Adventist Health Study 2, which includes dietary information from five groups: meat-eaters, semi-vegetarians (occasional meat-eaters), pesco-vegetarians (vegetarians who eat fish), lacto-ovo vegetarians (vegetarians who consume dairy) and vegans (who don’t consume any animal products).