However, in a redshirt year, student athletes may attend classes at the college or university, practice with an athletic team, and dress for play but may not compete in games. Using this mechanism, a student athlete has up to five academic years to use the four years of eligibility, thus becoming a fifth-year senior.
According to the Dietary Guidelines for Americans 2010, sedentary teen girls ages 13 to 18 need about 1,600 to 1,800 calories a day, while sedentary teen boys within the same age range require about 2,000 to 2,400 calories daily to maintain healthy body weights.
Girls need approximately 2200 calories, while boys need 2500-2900 calories. Protein. Protein is also necessary for physical growth, and should account for 15-20% of total calories. However, protein deficiency is quite rare in the United States, so protein consumption need not be overemphasized unless the teen is following a vegetarian or vegan diet. Fat. Many teens consume too much fat. Like adults, the diets of teenagers should contain no more than 30% of calories as total fat and 10% of calories as saturated fat. Teens should limit high-fat junk foods, and include foods containing essential fatty acids including walnuts, flaxseeds, pumpkin seeds, sunflower seeds, and cold water fish. Calcium. Nearly half of all skeletal growth occurs during adolescence.