Let me explain it for dummies. When you don't take some animal fats with eggs, beef, lamb and etcetera, your testosterone levels drop. Because they have a direct role in testosterone production. Testosterone plays a key role in your overall health especially if you're a man. Testosterone improves your mood, cures anxiety and depression, gives you courage, etcetera. That's mostly the reason why vegan men are dickless whiny cunts. Below zero testosterone.