“Well, I suppose I didn't sound very logical,” she admitted. “But the book—you just wait. It's in the kitchen. I'm going to get it.” And with laughing eagerness she ran from the room.
In a moment she had returned, book in hand.
“Now listen. This is the real thing—not my garbled inaccuracies. 'The food which we eat serves three purposes: it builds the body substance, bone, muscle, etc., it produces heat in the body, and it generates vital energy. Nitrogen in different chemical combinations contributes largely to the manufacture of body substances; the fats produce heat; and the starches and sugars go to make the vital energy. The nitrogenous food elements we call proteins; the fats and oils, fats; and the starches and sugars (because of the predominance of carbon), we call carbohydrates. Now in selecting the diet for the day you should take care to choose those foods which give the proteins, fats, and carbohydrates in just the right proportion.'”
“Oh, Billy!” groaned Bertram.
“But it's so, Bertram,” maintained Billy, anxiously. “And it's every bit here. I don't have to guess at it at all. They even give the quantities of calories of energy required for different sized men. I'm going to measure you both to-morrow; and you must be weighed, too,” she continued, ignoring the sniffs of remonstrance from her two listeners. “Then I'll know just how many calories to give each of you. They say a man of average size and weight, and sedentary occupation, should have at least 2,000 calories—and some authorities say 3,000—in this proportion: proteins, 300 calories, fats, 350 calories, carbohydrates, 1,350 calories. But you both are taller than five feet five inches, and I should think you weighed more than 145 pounds; so I can't tell just yet how many calories you will need.”
“How many we will need, indeed!” ejaculated Bertram.
“But, my dear, you know I have to have my eggs,” began Uncle William again, in a worried voice.
“Of course you do, dear; and you shall have them,” soothed Billy, brightly. “It's only that I'll have to be careful and balance up the other things for the day accordingly. Don't you see? Now listen. We'll see what eggs are.” She turned the leaves rapidly. “Here's the food table. It's lovely. It tells everything. I never saw anything so wonderful. A—b—c—d—e—here we are. 'Eggs, scrambled or boiled, fats and proteins, one egg, 100.' If it's poached it's only 50; but you like yours boiled, so we'll have to reckon on the 100. And you always have two, so that means 200 calories in fats and proteins. Now, don't you see? If you can't have but 300 proteins and 350 fats all day, and you've already eaten 200 in your two eggs, that'll leave just—er—450 for all the rest of the day,—of fats and proteins, you understand. And you've no idea how fast that'll count up. Why, just one serving of butter is 100 of fats, and eight almonds is another, while a serving of lentils is 100 of proteins. So you see how it'll go.”
“Yes, I see,” murmured Uncle William, casting a mournful glance about the generously laden table, much as if he were bidding farewell to a departing friend. “But if I should want more to eat—” He stopped helplessly, and Bertram's aggrieved voice filled the pause.
“Look here, Billy, if you think I'm going to be measured for an egg and weighed for an almond, you're much mistaken; because I'm not. I want to eat what I like, and as much as I like, whether it's six calories or six thousand!”