7 Diseases that strike young

"intro:"When we re young, we think we're invincible,"says Georges Benjamin, MD, Executive Director of the American public health association.""But we're not." And safeguarding, diseases we commonly associate with people in their 60s and 70s are hitting two, three, or even four decades earlier. Why? Better screening and early detection are part of the picture, but lifestyle factors such as poor diet and the fact that we're living more sedentary lives are to blame as well. Here, 7 diseases you can do something about today-- to make sure you feel better, longer.

QuickList: 1 category: diseases that strike Younger Than You Think title: Melanoma url: text: typical age of diagnosis: 50s and beyond

But it can hit as early as: late teens and early twenties

What you can do now: steer clear of tanning salons-- even occasional trips to the tanning bed can triple your chances of developing melanoma, according to the journal cancer epidemiology, bio-marker & prevention. Avoiding the sun altogether is next to impossible, so use a daily moisturizer with at least SPF 15-but many experts think SPF 30 is preferable. Wear a broad spectrum sunscreen if you're going to be outside, and avoid going out between 10 a.m.-2 p.m., when the rays are most intense, says Thomas S. Kupper, M.D., professor of dermatology at Harvard Medical School. There's also some evidence that a daily vitamin D supplement can help keep melanoma at bay, he adds.

Read more: 20 ways to prevent cancer

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QuickList: 2 category: diseases that strike Younger Than You Think title: Osteoporosis url: text: typical age of diagnosis: 65 and beyond

But it can hit as early as: 50 s

What you can do now: don't wait! "It's vital to strengthen bones early with vitamin D supplements and calcium," says Kathryn DIEMER, MD, clinical director of the bone health program at Washington University School of medicine. Do regular exercises that build muscle and strengthen your skeleton-such as jogging, walking or climbing stairs. "Smoking and alcohol are really toxic to the bones," says Dr. Diemer. Stick glass a day two for men, and ditch smoking to one for women. Finally, avoid cola: Its high phosphoric acid content can leach calcium from your bones.

Read more: do you need A bone scan?

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QuickList: 3 category: diseases that strike Younger Than You Think title: stroke url: text: typical age of diagnosis: over 65

But it can hit as early as: 20s or 30s

What you can do now: If you smoke cigarettes even occasionally, now's the time to quit because smoking doubles your chance of stroke. Something else that ratchets up risk? Health problems such as high blood pressure, diabetes, obesity and high cholesterol. "Diseases that increase risk should be treated early-- and be controlled," explains SHAZAM Hussain, MD, Section Head of the Cleveland Clinic stroke program. Dr. Hussain therefore recommends reducing your salt and trans fat intake, eating fish twice a week, and exercising. "Even if it's 30 minutes of walking a day, it will make a difference," he says.

Read more: 13 ways to naturally lower blood pressure

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QuickList: 4 category: diseases that strike Younger Than You Think title: breast cancer url: text: typical age of diagnosis: 45 and above

But it can hit as early as: teens