We must thank the supreme, the creator, the only one, who has made human to survive on Plants & animals and clearly prescribed in Holy Books before and inthe last words in form of Quaran, what to eat & what not to eat, Halal or Haram, and Hadith of our beloved Prophet(PUBH) inregard to Quantity, time .
The teeth structure, the stomch chemistry make human to be both veg Or non Veg. and survive