And that number increases with age.

That doesnt mean you have cancer or youll eventually get cancer, he says.

Even people who go their entire lives without a cancer diagnosis have these mutations.

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Our bodies have evolved amazing mechanisms to stop cancer in its tracks, DeGregori says.

But all it takes is one of those cells to go rogue, and it becomes full-blown cancer.

Those odds increase after the age of 50, when 90 percent of cancers occur, DeGregori says.

illustration of a man running in the countryside with drawings of organs and pill bottles tempting him to indulge in his vices

Your risk more than doubles during this decade, according to the American Cancer Society.

Still, there are steps you could take to help your immune system bring its A game.

Which screenings are right for you?

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It depends on your lifestyle and family history.

To get started, Brockton suggests visitingcancerhealthcheck.org, run by the AICR.

Its a quick assessment that can alert you to your specific lifestyle risk factors, he says.

It can also prompt you to have a more meaningful talk with your doctor.

But what aboutscreenings for lung canceror cervical cancer or prostate cancer?

Not everyone needs them, but youve reached an age when its time to discuss it with your doctor.

Its up to you to be the squeaky wheel, Chen says.

Most studies have found that nutritional supplements arent very effective at lowering cancer risk, DeGregori says.

Youre better off getting your vitamins the natural way, with fresh fruits and veggies.

Be wary of super-foods that promise a silver bullet, Goldberg says.

Theres no conclusive evidence that any specific food is necessary to prevent cancer.

The key is variety, not cherry-picking one magic food thatll save you.

The key is walking quickly rather than leisurely.

So be healthy but dont stress about being healthy.

Youll undo any good youre accomplishing if youre just worrying about not doing enough.

Do I still have a beer at night?

I just dont have three beers.

More Americans than ever are now overweight, and most of them are middle-aged, Martin says.

While youre there, ask about your calcium score.

Wait … whats that?

A Complete Guide to Your Symptoms and What to Do Next.

Even after a lifetime of inactivity, regular exercise can do wonders for your heart health.

The effects can be as profound as taking a statin, he says.

Just like walking for cancer prevention, the pace should be brisk.

Another study found a 21 percent increased risk for cardiovascular disease among people who waited until midday to eat.

In general, a healthy breakfast includes fresh foods, Patel says.

But its about more than the sex.

Simply being alone and isolated can increase your risk of cardiovascular disease by up to 29 percent.