Should animals be killed for food?

Humans are the top of the food chain. We are fed by animals and plants. There are a huge rang of animals which people eat. In different countries and cultures people eat different animals.
Personally, I think we can eat animals. Firstly, Because they are the main source for the protein we need. Besides scientists are saying that the protein we get from plants is completely different ,and it can't replace the animal protein.
secondly, In many countries farming can't provide enough food for people.such as, people in desert. Whereas there are animals which can live in this climate.Plants that people eat can't.
To sum up, animals have souls and they must be treated well. However God give us the power over them. so, we can use them ,as anything else, in moderation.