What is the Right Diet for Activity and Energy?

You started out hungry and even reached for seconds as you attempted to refuel your body. But instead, after having eaten a heavy meal, you just wanted to take a nap. What happened? Why, after eating most meals, do people feel lethargic?

On the other hand, have you noticed that sometimes you can skip a meal without realizing it, because you are so engrossed in your activity and gliding happily along? Maybe you stopped for a short snack and that was all you needed to continue your task. That lig...