While the evidence that links hair loss to dieting is becoming increasingly clear, you won't see diet companies providing this information on warning labels. Further, the faster you lose pounds with some of the more severe crash diets, including many liquid diets, the more stress you're putting on your body. This stress may increase the risk and incidence of thinning hair - hair loss is a high price to pay for dieting! A diet, by definition, deprives the body of one or more nutrients which are.