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Scientists in Boston found that drinking one or more regular or diet colas every day doubles your risk of metabolic syndrome—a cluster of conditions, including high blood pressure, elevated insulin levels, and excess fat around the waist, that increase your chance of heart disease and diabetes. One culprit could be the additive that gives soda its caramel color, which upped the risk of metabolic syndrome in animal studies. Scientists also speculate that soda drinkers regularly expose their taste buds to natural or artificial sweeteners, conditioning themselves to prefer and crave sweeter foods, which may lead to weight gain, says Vasan S. Ramachandran, M.D., a professor of medicine at Boston University School of Medicine and the study's lead researcher. Better choices: Switch to tea if you need a caffeine hit. If it's fizz you're after, try sparkling water with a splash of juice. By controlling blood pressure and cholesterol levels, preventing diabetes, and not smoking, you can add 6 to 9 1/2 healthy years to your life.

Concord grapes, blueberries, red wine: They all get that deep, rich color from polyphenols—compounds that reduce heart disease risk and may also protect against Alzheimer's disease, according to the new research. Polyphenols help keep blood vessels and arteries flexible and healthy. "What's good for your coronary arteries is also good for your brain's blood vessels," says Robert Krikorian, Ph.D., director of the Cognitive Disorders Center at the University of Cincinnati. Preliminary animal studies suggest that adding dark grapes to your diet may improve brain function. What's more, in a recent human study, researchers found that eating one or more cups of blueberries every day may improve communication between brain cells, enhancing your memory.

A few palm-size servings (about 2 1/2 ounces) of beef, pork, or lamb now and then is no big deal, but eating more than 18 ounces of red meat per week ups your risk of colorectal cancer—the third most common type, according to a major report by the American Institute for Cancer Research. Colorectal cancer risk also rises by 42 percent with every 3 1/2-ounce serving of processed meat (such as hot dogs, bacon, and deli meats) eaten per day, the report determined. Experts aren't sure why red and processed meats are so harmful, but one of their suspects is the carcinogens that can form when meat is grilled, smoked, or cured—or when preservatives, such as nitrates, are added. "You can have an occasional hot dog at a baseball game, but just don't make it a habit," says Karen Collins, R.D., a nutrition advisor at AICR. And when you do grill red meat, marinate it first, keep pieces small (kebab-size), and flip them often—all of which can help prevent carcinogens from forming. If you're baking or roasting it, keep the oven temp under 400°F.

A recent Harvard Medical School study found that people with more than 12 years of formal education (even if it's only one year of college) live 18 months longer than those with fewer years of schooling. Why? The more education you have, the less likely you are to smoke. In fact, only about 10 percent of adults with an undergraduate degree smoke, compared with 35 percent of those with a high school education or less, according to the CDC.

About 17 percent of Americans are flourishers, says a study in American Psychologist. They have a positive outlook on life, a sense of purpose and community, and are healthier than "languishers"—about 10 percent of adults who don't feel good about themselves. Most of us fall somewhere in between. "We should strive to flourish, to find meaning in our lives," says Corey Keyes, Ph.D., a professor of sociology at Emory University. "In Sardinia and Okinawa, where people live the longest, hard work is important, but not more so than spending time with family, nurturing spirituality, and doing for others."