36 DEPARTMENT BULLETIN 9*75, TJ. S. DEPT. OF AGRICULTURE. 
Chart 50. One Pound of Apple Pie. 
One pound of apple pie supplies about 2,225 calories of energy, 14 grams 
(about \ ounce) of protein, 0.01 gram of calcium, 0.05 gram of phosphorus, and 
0.9 milligram of iron. It would furnish, therefore, 35 per cent of the energy a 
man needs daily, 14 per cent of the protein, 3 per cent of the calcium, 4 per cent 
of the phosphorus, and 6 per cent of the iron. This is shown in the following 
chart : 
ENERGY 
mm 
wmm 
PROTEIN 
I41M 
■ 
CALCIUM 
ffl 
• 
PHOSPHORUS 
47M 
IRON 
GM 
10 20 JO *o So bo 7o 60 90 
-i L 1 t J 1 1 I 1 
Chart 50.— Proportions of energy, protein, calcium, phosphonis, and iron needed per man 
per day furnished by 1 pound of apple pie. 
USES OF THE CHARTS. 
The housekeeper or the student of foods can quickly see from the 
charts in just what proportions the five important constituents— fuel, 
protein, calcium, phosphorus, and iron — are supplied in 50 common 
foods. The charts are so simply arranged that a cursory reading will 
show these special characteristics of the various foods. For example, 
even a glance at the chart of American cheese will show that it is 
extremely rich in calcium. If desired, additional charts may be con- 
structed easily for other foods by using the figures for the nutritive 
requirements (p. 2) in relationship to the amount of energy, protein, 
calcium, phosphorus, and iron present in the foods as reported in 
tables showing food composition. 3 
The charts show how far a pound of any one of the foods goes 
toward supplying the fuel, protein, calcium, phosphorus, and iron 
needed daily by a man at moderate muscular work. The percentages 
of these constituents supplied by fractions of a pound can easily be 
calculated. Changes may also be made to indicate the relationship 
of a certain quantity of food to the requirements of a family or to a 
period of time longer than a day. 
How much of several different foods will be needed to supply the 
daily requirement of iron or any other element, can be found by 
adding the percentages representing this element. 
3 U. S. Dept. Agr., Office Expt. Sta. Bui. No. 
Food Materials. 
Chemical Composition of American 
