Fats at 4040 calories per pound
Carbohydrates at 1820 calories per pound
Measured by this rule the fuel value of:
| Whole milk is | 310 calories per pound |
| Skim milk is | 160 calories per pound |
| Full cream cheese is | 1885 calories per pound |
| Butter is | 3410 calories per pound |
Compared with other food, milk, although not suited to act as the sole food of adults, is one of the best and cheapest articles of diet, and should be much more extensively used.
The following table, compiled by specialists of the U. S. Department of Agriculture, shows the quantities of various foods needed to supply as much protein or energy as 1 quart of milk:
| Protein | Energy |
|---|---|
| 1 quart of milk is equal to— 7 ounces of sirloin steak 6 ounces of round steak 4.3 eggs 8.6 ounces of fowl | 1 quart of milk is equal to— 11.3 ounces of sirloin steak 14.9 ounces of round steak 9 eggs 14.5 ounces of fowl |
Another method of comparison is shown by the table below, in which the relative value of certain foods as economical sources of protein is given:
Milk at— | Is as cheap as sirloin steak at— | Or eggs at— |
|---|---|---|
| 7 cents a quart | 16.3 cents a pound | 17.6 cents a dozen |
| 8 cents a quart | 18.6 cents a pound | 20.1 cents a dozen |
| 9 cents a quart | 21.0 cents a pound | 22.6 cents a dozen |
| 10 cents a quart | 23.3 cents a pound | 25.1 cents a dozen |
| 12 cents a quart | 27.9 cents a pound | 30.2 cents a dozen |
| 15 cents a quart | 34.9 cents a pound | 37.7 cents a dozen |
According to this table, if milk is selling at 10 cents a quart, sirloin steak must sell as low as 23.3 cents a pound, and eggs at 25.1 cents a dozen to supply protein at equal cost.