. Bulletin of the Department of Agriculture. Agriculture; Agriculture. /Poor C£L£:/py tc//pa///=> o///oa/ I I I e<5'3 o/iao/p/jsis /s*o ca7^o/p/£'s epo o^^.o/^/£^ B/?r/^o /^/L/r. I Fig. 2.—Energy value of edible portion of root vegetables per pound. Just as a> engine must have fuel as a source of the power it supplies, so the body, which is a living engine, uses its food as fuel to supply the energy for the work it per- forms. For measuring the energy value of food the calorie is the most con- venient unit. It represents in round numbers the amount of heat required to raise 1 pou
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. /Poor C£L£:/py tc//pa///=> o///oa/ I I I e<5'3 o/iao/p/jsis /s*o ca7^o/p/£'s epo o^^.o/^/£^ B/?r/^o /^/L/r. I Fig. 2.—Energy value of edible portion of root vegetables per pound. Just as a> engine must have fuel as a source of the power it supplies, so the body, which is a living engine, uses its food as fuel to supply the energy for the work it per- forms. For measuring the energy value of food the calorie is the most con- venient unit. It represents in round numbers the amount of heat required to raise 1 pound of water from 0° to 4° F., and equals very nearly 3,087 foot- pounds. If it be assumed that the large square at the head represents 1,000 calories, the amount of energy which a pound of the different succulent vege- tables would supply is shown in graphic form by the black rectangles used for comparison. These values are, in general, low as compared with such a food as bread. Nevertheless, the succulent root vegetables as a group contribute ma- terially to the energy value of the diet in addition to furnishing material for the structural needs of the body. They are especially important for the mineral elements they supply, and in this respect rank high in comparison with other kinds of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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