What's the big deal with free radicals?

I have been hearing a lot about "free radicals". Is this "hype" or a real danger? They almost make is sound like free radicals are as dangerous in your body "traveling around" as a cancer tumor, that's why I'm wondering about the "hype" and "scariness factor"---are they as bad as they sound?

If so, what exactly are free radicals, and why are they so dangerous?

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Tags:

• Cancer