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.
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.