Staying hydrated is key to maintaining a good balance in the body. Headaches and fatigue can set in when you are not well-hydrated making concentration nearly impossible when you have a 'million things' that need to get done. Drink water throughout the day and avoid too much caffeine. If you prefer something other than water, juices and herbal teas are great choices. Because herbal teas are not made with tealeaves they usually do not have caffeine and provide an alternative to coffee and soda which can still perk you up.