13 health rules you can break

POSTED: 12:32 PM PST Jan 27, 2013    UPDATED: 11:00 PM PDT May 18, 2014 

Some health rules are followed religiously, but really have no medical or scientific foundation. Here are 13 popular rules that aren't as hard-and-fast as you might think.

hand, back of hand
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Don't crack your knuckles. The myth is that this habit will cause arthritis. It may be annoying, but no medical studies prove cracking or popping your fingers will lead to arthritis.

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