Leanness

Leanness is caused generally by lack of power in the digestive organs to digest and assimilate the fat-producing elements of food. First restore digestion, take plenty of sleep, drink all the water the stomach will bear in the morning on rising, take moderate exercise in the open air, eat oatmeal, cracked wheat, graham mush, baked sweet apples, roasted and broiled beef, cultivate jolly people, and bathe daily.

Source: The White House Cookbook, F.L. Gillette