Mild dehydration caused by exercise or heat can have negative effects on both your physical and mental performance.ĭoes drinking a lot of water help you lose weight? This usually happens when you’re sweating a lot or in a very warm room and not drinking enough water. Losing 1 percent of body weight might not seem like a lot, but it’s a significant amount of water to lose. A clinical study on older, healthy men reported that just a 1 percent loss of body water reduced their muscle strength, power, and endurance ( 7). Dehydration occurs when your body loses more water than you consume and can cause symptoms including fatigue and headache. One older study in females showed that a fluid loss of 1.36 percent after exercise impaired mood and concentration and increased the frequency of headaches ( 5).Ī more recent study in China that followed 12 male university students found that not drinking water for 36 hours had noticeable effects on fatigue, attention and focus, reaction speed, and short-term memory ( 6).Įven mild dehydration can reduce physical performance. Many people claim that if you don’t stay hydrated throughout the day, your energy levels and brain function start to suffer. Many factors affect how much water you need to stay healthy such as your health, activity, and environment.ĭoes water intake affect energy levels and brain function? Your body is doing the work for two (or more), after all.
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