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How much should you drink to stay hydrated during exercise?

(CNN)How much should you drink to stay hydrated during exercise? It’s that time of year when we encounter lots of advice about the importance of staying hydrated. Among other things, we’re told to down at least eight glasses of water a day and to “stay ahead of your thirst” before, during and after exercise to

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Sacrificing sleep? Here's what it will do to your health

(CNN)We are one groggy, cranky, sleep-deprived population. But according to the US Centers for Disease Control and Prevention, a third of us get fewer than seven hours of sleep per night. In addition, 50 million to 70 million Americans suffer from sleep disorders such as sleep apnea, insomnia and restless leg syndrome, which can ruin

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What Caffeine Does To Your Body And Brain

Many of us depend on caffeine. Some of us can’t even start our day without it. Whether you get your daily caffeine fix from coffee, tea, or a canned energy drink doesn’t make much of a difference. It’s still a stimulant with some positive and negative effects. For starters, caffeine makes most of us feel