An ideal intake of protein is 0.8 grams per kilogram of body weight. Lack of proteins will lead to a weak body, which is unable to fight against diseases. Excess protein is defined as more than 1.6 grams per kilogram of body weight. A protein deficient diet may be better tolerated than a protein excess diet; too much protein in the diet is not healthy. The extra protein contains nitrogen, which is changed in the liver into a waste substance called urea. The kidneys need to get rid of this waste by excreting it in the urine. Too much protein can thus put a stress on the liver and kidneys.