A detox diet is a dietary regimen involving a change in consumption habits in an attempt to detoxify the body by removal of toxins or other contaminants. It is claimed to improve health, energy, resistance to disease, mental state, digestion, as well as aiding in weight loss. Detox diets usually suggest that fruits and vegetables compose a majority of one's food intake. Limiting this to unprocessed (and sometimes also non-GM) foods is often advocated. Limiting or eliminating alcohol is also a major factor, and drinking more water (which helps curb appetite) is similarly recommended. Critics point out that the human liver, kidneys, lungs and skin have evolved to adequately expel environmental contaminants and are perfectly equipped to continue to do so unassisted. It has been posited that some fruits and vegetables may actually contain more natural toxins than animal substances such as meat, fish, and milk.