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.
Care: 1  Nutrient Needs: The amount of calories and protein that your teenager needs each day depends on his age and weight in kilograms. Divide your teenager's weight in pounds by 2.2 to figure out what he weighs in kilograms (kg). 2  Calories. From 12 to 14: about 45 to 55 calories per kg. 3  Changing Food Habits.