What happens to excess proteins in the body? It is converted to fat. Excess dietary protein is NOT stored as protein and it is NOT converted into muscle. Once the body converts the protein into fat from the carbon skeleton (the carbon, hydrogens, and oxygen) the body must secrete the nitrogen because it is toxic.
Excess glucose gets stored in the liver as glycogen or, with the help of insulin, converted into fatty acids, circulated to other parts of the body and stored as fat in adipose tissue. When there is an overabundance of fatty acids, fat also builds up in the liver.