Don't have unprotected sex
Actually it's probably advisable to avoid unprotected sex altogether, unless you're in a committed, monogamous relationship like, say, Tiger Woods. But this rule goes double for anyone presently uninsured. According to the American Social Health Association, there are approximately 19 million new cases of STDs each year.

Exercise, even if you can't afford a gym membership
Not only does regular exercise improve overall brain function, but exercise is also linked to higher IQ in young adults. It will improve your mood, unless you're a cynical bastard, and keep your immune system sharp.

Be social
Social interaction improves health. "World of Warcraft" partners may or may not count. So get out of the house and meet up with some friends, even if they're miserable people.
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