My girlfriend’s daughter just turned 7. We were eating some food at a restaurant the other day and I watched her eat 2 cheeseburgers, half an order of French fries, a small milkshake, and a few good sips of a soft drink. I looked up all the nutrition data for her meal, and it totaled, by modest estimates, 1,200 calories. She weighs a whopping 49 pounds. That day she consumed over 2,500...