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Drink plenty of water. We've been trained to believe that eight glasses a day is a one-size-fit-all number for how much water we should be drinking. But in reality, there is no magic number. "Water needs are actually individual and can vary according to your body weight, activity level, health status, and temperature outside," says Rouleau. One rule of thumb you can follow is 1oz per 30 kcal of calories consumed. If you're not one for a math equation, download the iDrated phone app, which will determine exactly how much you should be drinking according to your age and weight.

Rouleau's tips:

• Drink a glass of water as soon as you wake up.
• Keep water next to your bed when you go to sleep at night.
• Keep water at your desk at work.
• Put a sticky note on your computer to remind you to drink up.
• Carry a water bottle with you in your bag.
• Drink before, during, and after exercise. If exercising for longer than 60 minutes, consider a sports drink.