I don't doubt Christian is trying to force you to lose weight. However, I'm going to assume he is reading along with what I'm telling you and suggest he do it in a healthy way.
Protein, unlike fats and carbs, does not turn into fat. Protein can be converted into energy and muscle by the body. The body needs energy to power the brain and circulate the body fluids. Without this, Christian will cease to exist.
The best sources of protein is lean meat. Another good source is whey protein which is a powder you mix with water.
The body also needs fiber and vitamins and minerals; all of which can be gotten as supplements.
Christian: If you wear out the body, where are you going to live?