Caffeine gets a bad rap because it can cause restlessness, insomnia, and even heart problems when you exceed the recommended cap of 300 mg a day (that's roughly three small cups of coffee). However, as long as you don't overdo it, Teitelbaum says caffeine is a great way to boost energy. Just be sure it comes from a healthy source. Skip the sugar-packed sodas and energy drinks, and sip coffee or tea instead — but no more than a couple of cups a day. "If you drink a whole pot of coffee, the high amount of caffeine will stress your adrenal glands, the body's stress handlers, and your blood sugar drops." Also, sugar makes it worse, so go for a French roast over a Frappuccino.
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