Very often people try to eliminate excess weight by means of independently picked up diets in spite of the fact that always it is possible to use the help of experienced experts. Why? Because it at first sight seems very simple decision. However actually harm of diets is comparable with harm of selftreatment for this reason It is necessary to tell that incorrectly picked up diet can carry the true danger, instead of simply harm. We will survey some power supply systems which can be potentially dangerous to the person: The diets based on including in a ration of a large amount of proteins There is a lot of such diets, and all of them are popular as are actually effective. Thus It should be noted their such negative sides, as depression of efficiency of the person, vitality loss, as well as problems in the genesial sphere. Thus such power supply systems can be very dangerous to people with diseases of kidneys for this reason to abuse them is inadmissible. The diets based on the use of one product The wise nature put in the person aspiration to a variety which is expressed and in alimentary habits. However actually long use in nutrition of one product attracts emergence of neurologic disorders, as well as allergies, to get rid from which in the future it will be very difficult. Japanese diet This type of a delivery is focused on correction of a metabolism which upon sharp transition to the new menu can strongly suffer and glitch. For this reason dietarians persistently warn about danger of such diet and advise to refuse it. The diets based on lack of fats Fats are vital to the person, therefore depression of their consumption to level which less than daily norm can be dangerous. Dietarians advise not to take such radical measures and to correct amount of fats in a ration only a little, otherwise instead of a slim figure it is possible to receive sterility and problems with a metabolism. The diets based on the use of sweets For sweet teeth it is ideal option which from a position of dietology is very dangerous. At best a consequence of such power supply system there can be problems with teeth, and in the inferior thus it is possible to get diseases of a pancreas, kidneys and a liver. Diets for fast weight reduction Until recently such diets were at popularity peak, however now, fortunately, the number of their admirers is reduced. There is it because such methods of weight reduction yield short-term result which is lost very quickly, thus harm from such weight reduction remains for the rest of life. Thus, it is possible to draw a conclusion on harm of the majority of known diets and that, despite their variety, optimum there is the healthy delivery which has become a habit.