SWIMMING DEMANDS LOTS OF CALORIES Hi. My son is 16 and is on the high-school swim team. They practice twice a day -- in the morning at 6:15 for one hour, and again at 5:30 p.m. for two hours. He is 5 feet, 9 inches tall and weighs 130 pounds. This morning he ate a banana before practice and was not going to eat again until noon, when he would eat a sandwich, a cheese stick, some chips and a drink. He will not have dinner until sometime between 7:30 and 8 p.m. What would be the best foods for him before and after practice -- things he can snack on? -- J.C.
DEAR DR. DONOHUE:
ANSWER: His entire diet needs revising -- not just his snacks. Your son's height puts him right on the middle rung for boys his age. His weight is slightly below average. His body mass index, an even better measure of body mass than scale weight, is 19.1, with the normal being 18.5 to 24.9, so he's normal but low normal.
Swimming is a vigorous sport. An hour of strenuous swimming burns as many as 700 calories. Swimming three hours a day, as he does, he needs 2,100 calories to support that activity. It doesn't sound to me like he's getting those 2,100 calories in his diet.
The calorie demand of simply keeping his body alive -- producing body heat, keeping the heart beating, supplying the breathing muscles with fuel -- is, for him, at least 1,300 calories.
He is still growing -- something that consumes more calories.
If you add up all the calories he needs in one day, he requires 4,000 or more. I hope his evening meal is huge. His breakfast is not. He can't possibly provide swimming muscles with enough energy after an overnight fast and a breakfast of only one banana.
He should have three large meals a day. He should also get in two to six snacks. Some suggestions are: half a cup of raisins (222 calories); a peanut butter and jelly sandwich (348); six Oreo cookies (280); 10 dates (230); an ounce of peanuts (166); an ounce of walnuts (175).
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我明白为什么我怎么游都不长肉了——游大了 呵呵 =)