Question: how many calories should a young man eat?
Answer: Here's the average calorie number for a man who wants to maintain his current weight based on a moderately-active man of average height (approximately 5'10") who weighs 175 pounds: 20-year-old man: 2800 calories per day. 30-year old man: 2728 calories per day. 40-year old man: 2651 calories per day.