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Three signs you're dehydrated

Ask any fitness expert to list a couple of common workout roadblocks, and dehydration will likely always make the cut. It's a killer! You need water to exerciseyou thrive on ityet so many women spend their days dehydrated.

So, what gives? It could be because, when it comes down to it, you may not even know exactly when you're dehydrated. To solve that problem, we asked Greg Justice, an exercise physiologist at AYC Fitness in Kansas City and author of Mind Your Own Fitness, to list the top signs you need to get way more H20 happy.

You Have a Headache

Unless you're chugging water 24/7, your body is constantly losing fluid. That means you're also losing essential salts like sodium and potassium because those are in the fluids you're losing.

Now get this: That salt loss actually changes the chemical makeup of your blood. Your brain, in turn, is super sensitive to that changeand it's that sensitivity that triggers a headache. Make sense? The headaches get even worse, too, depending on how much water you lose.

"The more water you lose, the more your blood volume drops, which causes less oxygen flow to the brain," says Justice. "That causes your blood vessels to dilate, which can make your headache feel even worse." Moral of the story: Not enough water equals headache central.

Your Pee is Extra Yellow

Eekkinda gross, right? But it's true. The reason this happens is that your urine is over-concentrated with waste.

"When you're fully hydrated, the waste is easily flushed out in a more efficient manner," says Justice. But when there aren't enough fluids in your body, the waste isn't as easily flushed out, so it stays there.

You're Constipated

Again, kinda gross. But again, totally true. And the reason is somewhat similar. See, water helps move your waste through your colon and out of your body.

"But if that water isn't there to begin with, it won't be able to move your food waste onward and outward as efficiently," says Justice. Hence the constipation.