These odd facts about the human body prove the saying truth is scarier than fiction.

11. What makes my stomach growl?

11. What makes my stomach growl?
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It can be the sound of your digestive juices churning and stomach muscles contracting as they get prepped for food.

To avoid those often poorly timed and embarrassing sounds, eat smaller meals more frequently.

Bonus health benefit: This will also jumpstart your metabolism. —MD advisers from The Doctors.

Tummy giving you grief? Check out the 12 reasons it may be bloated.

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12. Why do I sometimes get side stitches when I run?

12. Why do I sometimes get side stitches when I run?
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Your diaphragm gets stretched, pulled, and pounded during a run, which can cause that sharp, stabbing pain at the lower edge of your rib cage, usually on the right side of your body.

To help the pain pass, slow down and take more controlled, easy breaths. —MD advisers from The Doctors.

While we are on the sibject, do you think running is a great way to shape up or a pathway to trouble?

13. Why does armpit sweat smell worse than other sweat?

13. Why does armpit sweat smell worse than other sweat?
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Your body has two kinds of sweat glands.

Most of those on your arms and legs secrete a mix of water and salt.

But the glands in your armpits (as well as your groin) release an oily substance, which bacteria love.

It’s actually the bacteria eating the oil that releases the telltale stench. —MD advisers from The Doctors.

Still curious about the many mysteries of the human body? Take a look at the mysteries surrounding the human body that are more fiction than fact.

This article first appeared on RD.com.

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