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.
  Although adolescence spans a period of five to seven years, teens do most of their growing during an 18-24 month period called the growth spurt.. To support this rapid growth, teenagers need to consume lots of calories and other nutrients.    Calories   Teenagers need lots of calories to support rapid growth. Girls need approximately 2200 calories, while boys need 2500-2900 calories. Although adolescence spans a period of five to seven years, teens do most of their growing during an 18-24 month period called the growth spurt.. To support this rapid growth, teenagers need to consume lots of calories and other nutrients.