Water // Muscles, organs-every cell in your body depends on fluids to function properly. You can boost your outlook and energy. Researchers have found that mild dehydration, which starts when you fall to 98.5 percent of your body’s 100 percent water volume, can muddy thinking and reaction times, leaving you fatigued.
Hydration // hydration experts warn that you may not even feel thirsty from mild dehydration. To avoid a slump, drink fluid throughout the day. Water is the best choice: Sugary and caffeinated drinks can leave you feeling worse than before.