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The percentage of fat in fish varies from less than 1 per cent. in some cases to a trifle more than 14 per cent. in others, but this high percentage is rare, as the average fish probably does not exceed from 3 to 6 or 7 per cent. of fat. This variation affects the total food value proportionately. The varieties of fish that contain the most fat deteriorate most rapidly and withstand transportation the least well, so that when these are secured in large quantities they are usually canned or preserved in some manner.

Fish containing a large amount of fat, such as salmon, turbot, eel, herring, halibut, mackerel, mullet, butterfish, and lake trout, have a more moist quality than those which are without fat, such as cod. Therefore, as it is difficult to cook fish that is lacking in fat and keep it from becoming dry, a fat fish makes a more palatable food than a lean fish. The fat of fish is very strongly flavored; consequently, any that cooks out of fish in its preparation is not suitable for use in the cooking of other foods.

CARBOHYDRATE IN FISH.

--Like meat, fish does not contain carbohydrate in any appreciable quantity. In fact, the small amount that is found in the tissue, and that compares to the glycogen found in animal tissues, is not present in sufficient quantities to merit consideration.

MINERAL MATTER IN FISH.

--In fish, mineral matter is quite as prevalent as in meat. Through a notion that fish contains large proportions of phosphorus, and because this mineral is also present in the brain, the idea that fish is a brain food has become widespread. It has been determined, however, that this belief has no foundation. FOOD VALUE OF FISH

FACTORS DETERMINING FOOD VALUE.

--The total food value of fish, as has been shown, is high or low, varying with the food substances it contains. Therefore, since, weight for weight, the food value of fat is much higher than that of protein, it follows that the fish containing the most fat has the highest food value. Fat and protein, as is well known, do not serve the same function in the body, but each has its purpose and is valuable and necessary in the diet. Some varieties of fish contain fat that is strong in flavor, and from these the fat should be removed before cooking, especially if the flavor is disagreeable. This procedure of course reduces the total food value of the fish, but it should be done if it increases the palatability.

RELATIVE NUTRITIVE VALUE OF FISH AND MEAT.

--When fish and meat are compared, it will be observed that some kinds of fish have a higher food value than meat, particularly if the fish contains much fat and the meat is lean. When the average of each of these foods is compared, however, meat will be found to have a higher food value than fish. To show how fish compares with meat and fowl, the composition and food value of several varieties of each food are given in Table I, which is taken from a United States government bulletin.