18" x 24" * laminated "Pounds add up faster than you think," declares this poster, explaining that the equation for no weight gain is to match the calories you take in with the calories you burn. Want to drink a soda every day for a week? Do the math first: You'll consume 1750 extra calories, calories that you could burn off by going bowling - for seven and a half hours! By simply presenting the numbers, students are cautioned against unhealthy eating and are reminded of the importance of exercise.