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.
Protein, found in meat, poultry, fish, and beans, should make up between 10 percent and 35 percent of total calories. Teenage boys ages 9 to 13 need 34 grams of protein per day; ages 14 to 18 require 52 grams. The remaining 20 percent to 35 percent of daily calories should come from healthy fats.