Vegetarians drink milk and eat dairy products. Vegans eat no animal products. Meat eaters and vegetarians are the Yang. By eating animal flesh or drinking their body fluids, one ingests their hormones. Vegetarians often drink more milk and eat more dairy than meat eaters.
Vegans eat no animal hormones.
Vegans are the Yin. Nutrition and Athersclerosis by Louis Katz. The study measured testosterone levels in 696 Oxford University men. Vegan diets are appropriate for all stages of the life cycle, including during pregnancy and lactation. Am J Clin Nutr.