1. the act of attenuating or the state of being attenuated. 2. (General Physics) the loss of energy suffered by radiation as it passes through matter, esp as a result of absorption or scattering.
A healthy teenage boy may have a higher calorie intake of about 2,200 calories per day; about 61 to 86 g of fat should be consumed. Read more: http://www.livestrong.com/article/399246-a-teen-needs-how-many-grams-of-fat-per-day/#ixzz2QFhZ92Aj. For both teenage boys and girls, 5 to 6 tsp. of fat are recommended daily. Fat can't always be measured by the teaspoon, however, so it is easier to think of fat in actual percentages.
The Institute of Medicine recommends that teenage boys consume at least 130 grams of carbohydrates each day and that 45 to 65 percent of their total calories come from carbs. So, teen boys should get 225 to 325 grams of carbs as part of a 2,000-calorie diet, 293 to 423 grams for a 2,600-calorie diet and 360 to 520 grams of carbs per day if they are eating a 3,200-calorie diet.