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.
Active teen guys have significantly larger daily calorie requirements. At age 12, active boys need about 2400 calories a day to stay healthy. That need increases by 200 calories each year the youth ages, and the daily calorie requirement peaks at 3200 calories between the ages of 16 and 18 years old.