Factors That Affect Caloric Intake

Boys 14-18 years old whom are somewhat active needs 2,400-2,8000 calories per day. 

Girls 14-18 years old who are somewhat active need 2,000 calories per day

Gender affects caloric intake requirements. Boys have less body fat and more muscle mass compared to girls and muscle burns more calories than fat, therefore they must have a larger caloric intake.

Activity affects the amount of needed calories. Someone who is more active needs more food because they are burning off calories and using up energy therefore they must consume more compared to someone with a less active lifestyle who does not need to consume as much.

Age is another variable. Teens are growing and need more food because we are in a prime time of change. Our bodies need to be fueled with the correct amount of food to ensure maximum growth, which will assist our changing bodies, compared to a person who is finished with their years of growth and can eat less.

https://www.nhlbi.nih.gov/health/educational/wecan/downloads/calreqtips.pdf
https://www.healthunit.com/outdoors-the-ultimate-playground
http://www.123rf.com/photo_9155015_cartoon-teen-relaxing-on-the-sofa-he-is-eating-a-snack-and-has-a-soft-drink-handy.html