You would die...seriously. But in reality unless you don't eat you will be consuming portein, albeit not necessarily complete proteins. All food except pure fat and pure sugars contain proteins and thus amino acids. Protein is ESSENTIAL to life. Protein makes just about everything work in your body, though every system in the body is dependant on another so that's more or less a gross oversimplification. You need amino acids to produce the many, many proteins of the body. Hormones, receptors, neurotransmitters, carrier proteins, anit-body's, enzymes, and of course, muscle tissue(not just skeletal muscle tissue either). These are all comprised of amino acids. 9 of the amino acids the body can't make so it is dependant upon diet to supply these essential amino acids(10 are essential for infants). Grains, legumes, fruits, and veggies all contain proteins. They all lack one or more of the essential amino acids, however, which means other foods with the missing amino acid/s must accompany other non complete proteins in the diet. Atheletes/bodybuilders see protein as strictly the muscle building nutrient, which it indeed is, but protein is much more. Proteins are the action molecules of life. When protein intake is insufficient protein degredation will surpass protein synthesis and the body will begin to break down muscle tissue to liberate amino acids for other bodily functions. Size and strength then will wltimately be lost. Further lack of protein will inhibit the synthesis of receptor, transport, nuerotransmitter, and enzyme proteins. This inevitably will lead to the death of the organism. This would occur through starvation. So not only would you shrivel away to nothing, but you would would die and thus look like complete shit in your casket. Not a good way to leave a final impression. Proteins are essential for LIFE, not just muscle growth. We, bodybuilders/weight trained athletes use protein to grow muscle tissue to improve size and contractile ability, the body has other ideas, however, in times of inadequate nourishment.