Why have the consumption of pork and the meat of domestic donkeys been prohibited in Islam, and is there a relationship between the foods people eat and their dispositions?

The summary of the answer:

That which nourishes resembles that which is nourished. This is evident in Allah's wisdom by prohibiting impure foods, because they become part of a person and affect him. Eating blood and the flesh of beasts of prey bequeaths aggressive, satanic strength, and eating pork bequeaths harshness. The flesh of dogs and beasts of prey bequeaths their power. Therefore, these foods were prohibited, except in cases of necessity. As for camel meat, ablution after eating it is legislated to counteract the incidental satanic power within it. The flesh of domestic donkeys was prohibited due to its donkey-like nature, and blood was prohibited because it is the pathway for Satan. This contemplation opens a great door to knowing Allah and His names and attributes.