Question

Is there a special diet Buddhism have to follow?

Answer 1

Onions, Garlic, Scallions, Chives and Leeks, "the five pungent spices" are forbidden for some sects (China, Vietnam) for pretty much the same reason as in Hinduism, they're said to lead to anger (raw) and passion (cooked), but the Buddhists add that their odors repel gods and attract hungry ghosts and demons.