Interestingly, I just watched a show last night about a goat with a habit of eating Turkish bread which somewhat related to this. They said the bread would be toxic to the goats due to the effect the rich source of carbohydrates has on their gut biome. A certain bacterial population explodes because of the abundant food, which effects a massive change in gut pH, killing many good bacteria and causing acidosis, and the goat dies. Basically what I'm saying is humans are spared from a lot of the serious effects of a bad diet that we would see in other animals, but we need to stop being stupid about that fact. Your gut bacteria actually do serve a purpose...