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The increasingly popular high-caffeine beverages called energy drinks may do more than give people a jolt of energy -- they may also boost heart rates and blood pressure levels, researchers said on Tuesday.

"We saw increases in both blood pressure and heart rate in healthy volunteers who were just sitting in a chair watching movies.

But the increases potentially could be significant in people with cardiovascular disease or those taking drugs to lower heart rate or blood pressure, they told a meeting of the American Heart Association in Orlando, Florida.

20. Drink an 8-ounce glass of water every two hours. A study from Loma Linda University in California found that women who drank more than five glasses of water a day were half as likely to die from a heart attack as those who drank less than two. This is likely due to the fact that maintaining good hydration keeps blood flowing well; dehydration can cause sluggish blood flow and increase the risk of clots forming. Water works best when it comes to improving blood flow; soda is worthless.

We're dying less often because of the technological and pharmacological advances of modern medicine. But is your idea of a healthy future being pulled back from the brink by bypass surgery?

Far preferable is avoiding cardiovascular disease altogether.

May be good for sex – Citrulline is the special nutrient in watermelon that gives rise to arginine. One gram of watermelon flesh contains 1.5 mg of citrulline. When citrulline is converted to arginine, this can lead to the relaxation of the blood vessels, which is the same basic effect of drugs for erectile dysfunction like Viagra and Andros. Watermelon may not be as potent as these drugs, but it can still help the heart, brain and male sexual organ, too. And watermelon comes without the drug’s side effects. 5. Your source of alkaline water – The good news is that watermelon is made of 92% pure alkaline water. A lot has been said about the possible benefits of alkaline water. Compared to the acidic juices of oranges and pineapple (which may irritate people with ulcer and gastritis), watermelon is safe for your stomach. 6. Good for the mouth and digestive tract - Watermelon has health benefits for the whole digestive tract, starting from the mouth, esophagus, stomach and intestines. Watermelon can relieve the pain of people with singaw or mouth sores. Some experts claim that watermelon can also minimize bad breath. And as it goes down to the intestines, it can treat constipation and normalize your bowel movement.