It's difficult to concentrate when you are tired or hungry. That's why a balanced meal--one that contains protein (like dairy products, lean meats or soy), complex carbohydrates (like whole grains or veggies) and good fats (like nuts or avocados)--can actually keep your body and mind fueled longer. Next time you feel drained in the late morning or late afternoon, ask yourself what you ate at your last meal. Did it contain an ideal balance?

This week's challenge: Make sure all your breakfasts and lunches contain the "power trio" of protein, complex carbohydrates and a little bit of "good fats."