According to nutritionist Joy Bauer, doctors in England have discovered that protein stimulates cells in the brain that promote wakefulness. If you always seem to have mid afternoon fatigue, think about what you are eating for lunch and/or snacks. Try adding more protein and see if that won't help you fight that dreaded afternoon fatigue. Too often we eat a carb-heavy lunch or afternoon snack and then wonder why we are fighting fatigue. Try adding some peanut butter, nuts, etc for more protein. Having a salad for lunch? Be sure to add a chopped boiled egg, bacon bits, sliced chicken breast, etc to give it that protein boost.