FATS, { { } These make up the { { Stearin, } bulk of the fat of composed { _Neutral { } the body. mainly of { Fats._ { Palmitin, } They are likewise { { } the chief { { Olein, etc. } constituents of _Carbon_, { { } tallow, lard, etc. { _Oxygen_, { _Complex { Protagon, } Found chiefly in { Fats_, { } the brain, spinal _Hydrogen_, { containing { Lecithin, } cord, nerves, etc. { phosphorus { } { and nitrogen. { Cerebrin. } CARBOHYDRATES, { Glycogen, "animal starch." Occurs in the composed { liver and other organs. of { Inosite, "muscle sugar." Occurs in various _Carbon_, { organs. _Oxygen_, { Lactose, "milk sugar." Occurs in milk. _Hydrogen_. { Cholesterin. Occurs in brain, nerves, and other { organs. { Phosphate of lime, or calcium } { phosphate. } Occurs chiefly { Carbonate of lime, or calcium } in bones and { carbonate. } teeth, though { Fluorid of calcium, or calcium } found in { fluorid. } other organs. { Phosphate of magnesia, or } { magnesium phosphate. } { MINERAL { PHOSPHATE OF POTASH, OR POTASSIUM } SALTS. { phosphate. } { Sulphate of potash, or potassium } Distributed { sulphate. } through the { Chlorid of potassium, or } body in the { potassium chlorid. } blood, muscle, { Phosphate of soda, or sodium } brain, { phosphate. } and other { Sulphate of soda, or sodium } organs. { sulphate. } { Chlorid of sodium, or sodium } { chlorid. } Now, since the body is composed of these substances, our food, including air and water, should contain them all in due proportion, that the growth, energy, and repair of the body may be healthfully maintained. THE FIVE FOOD PRINCIPLES For convenience of comparison foods may be divided into five classes: Water, Protein, Fats, Carbohydrates, Mineral Matters.