In extreme cases a fast of two or three days, with a copious use of water, is recommended. Following this fast the diet should consist of easily digested foods, eliminating those containing starch and sugar in too great proportions, as bread, cereals, and potatoes. The amount should be as limited as is consistent with the actual necessity for rebuilding and for energy. The taking of fats should be restricted in biliousness. The presence of fat in the duodenum stimulates the flow of pancreatic juice, which in turn stimulates the secretion of bile, thus overworking the liver. Lemon stimulates the action of the gastric glands and thus tends to increase the liver activity. It has been thought that eggs and milk cause sluggish liver action. There is no physiological reason for this if too much food is not eaten. The fact is often lost sight of that milk is a food as well as a beverage and that when milk constitutes an appreciable part of the diet other foods should be limited accordingly. The DIET may be selected from the following: _Soups._—Light broths and vegetable soup with a little bread toasted in the oven. _Fish._—Raw oysters, fresh white fish. _Meats._—Mutton, lamb, chicken, or game. _Farinaceous._—Whole wheat or Graham bread and butter, toast buttered or dry, toasted crackers, cereals in small portions. _Vegetables._—Fresh vegetables, plain salads of watercress, lettuce, and celery, without oil or mayonnaise dressing. Lemon juice and salt may be used. _Desserts._—Gelatins, fruits, cornstarch, ice cream, junket, simple puddings,—all with _very little sugar_. _Liquids._—Hot water, lemonade, orangeade, toast water, buttermilk, loppered milk, and unfermented grape juice—not too sweet. AVOID.—All rich, highly seasoned foods, candies, cheese, pies, pastry, pancakes, or any fried foods, salmon, herring, mackerel, bluefish, eels, dried fruits, nuts, and liquors of all kinds. * * * * * [Sidenote: Gallstones] Gallstones occur most often in persons after middle life, especially in those of sedentary habits. A substance called cholesterin is normally present in solution in bile and in the tissues. When, through inactivity of the liver, or when because of sedentary habits the bile remains too long in the system, the cholesterin is precipitated, and, mixed with mucus, it forms gall-stones. A diet composed mostly of starch and fat favors their formation. All dietetic measures should be combined with exercise to promote the flow of bile into the intestines. Two glasses of hot water should be taken in the morning and before retiring. Several glasses of cold water should be drunk through the day. Sweets and starches should be largely eliminated from the diet; sweet fruits and root vegetables must be avoided.