【How-to】How many calories should you eat for lunch

Based on these guidelines, 15-year-old boys need between 2,000 to 2,400 calories a day if they are sedentary, 2,400 to 2,800 calories a day if they are moderately active and 2,800 to 3,200 calories a day if they are active, or engage in physical activity equivalent to walking more than 3 miles per day at 3 to 4 mph in …