Question: how much should a 12 year old eat in a day?
Answer: Active 12-year-old boys should consume 2,000 to 2,600 calories. Somewhat-active boys should consume 1,800 to 2,200 calories. Boys who are not as active should consume 1,600 to 2,000 calories. For girls, these ranges are 1,800 to 2,200; 1,600 to 2,000; and 1,400 to 1,600, respectively.