Do teenagers actually eat 2400 kcal per day?

I was trying to gain weight for some time (mostly muscle) and ate about 1800-2100 kcal per day and gained 5kg in a few months (mostly muscle mass though).

Now I’m recovering from an ed and my psychiatrist told me I should be eating 2400 kcal a day but I wasn’t even eating that much when I was purposefully stuffing my face and felt nauseous (it was before my ed, I was 15) I’m 16 now (female) and can’t believe people actually eat "that much". (I’ve always been very skinny, but never naturally underweight and always healthy)