Leanness, the opposite of fatness, afflicts some persons, and is often so extreme as to cause humiliation. The remedy is to find out the cause and remove it if possible. As to diet, reverse the principles applied to obesity. Lean people are generally perversely lean, and will not get fat, even when in perfect health. Systematic nourishment, rest, and forced feeding, with a complete diet, in which fats and carbohydrates must play a good part, can be recommended. Medical supervision should be employed also. The organs and their functions should all be supervised, lest harm come from rest and forced feeding.