I think it's pretty normal for teenagers to do intermittent fasting without even considering it intermittent fasting. Many teens do not eat breakfast. If you are that way, normally your family hammers that out of you with begging you to eat "the most important meal of the day." Never mind that most teens aren't hardly even awake at breakfast.
I honestly think that skinny, active boys should just eat as much as they possibly can and shouldn't eat breakfast if they don't want it. They shouldn't fast for the sake of fasting because of anything they read somewhere. Girls shouldn't fast because they are so prone to anorexia and bulimia. Boys like Gadsie who seem on the verge of anorexia shouldn't be encouraged to fast because it's likely that someone as obsessive and skinny as him will probably be as prone to anorexia nervosa as any girl could ever be.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Highest squat: 167.5 x 2. Current Deadlift: 190 x 3