You don't realize how much you need it until you don't have it -- or you have too much of it. We're talking about saliva.

Saliva can actually tell you a lot about your body.

Here's a fun fact: You produce 50 ounces of saliva every day! It has many important jobs -- from preventing tooth decay to helping prevent infections.

If you're running low on saliva and your mouth feels dry, it could be from medication.

There are over 300 medications that have the symptom of dry mouth -- from over the counter cold and allergy meds, to prescription drugs. So if that's you, check that packaging insert for details.

If you have too much of it and you’re a woman, it could be a sign you’re pregnant.

It's not known why pregnant women produce more. Researchers say it could either be from hormones or a side effect of feeling nauseous.

If it tastes bitter or sour -- you might have acid reflux.

What you're actually tasting is the stomach acid that's bubbling up in your throat. You should talk to your doctor about this.

If it's a little tacky on your tongue, you could be a mouth breather and could be a sign of sleep apnea.

And let's not forget the fact that it contains tons of genetic markers. Which is why swabbing inside your check is a common way to grab DNA for testing.

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