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You constantly have a water bottle in hand
You constantly have a water bottle in hand
ISTOCK/HALFPOINT

If you carry around your water bottle all day and immediately refill it when it depletes, you may be drinking too much water. Constantly adding water to your body can result in low sodium levels in your blood, which can cause all of the cells in your body to swell. According to exercise professor Tamara Hew-Butler, this can become particularly dangerous when your brain starts to swell. “Your brain can only swell about 8-10% before it reaches the skull and it pushes your brain stem out,” says Hew-Butler.