We'll eat dark chocolate however we can get it—kisses, squares, bars... straight from a dessert fountain.

Luckily, there are myriad reasons that make this treat nearly guilt-free (in moderation, of course).

For one thing, we know dark chocolate is healthier than white chocolate and milk chocolate. One ounce of dark chocolate is chock-full of antioxidants and flavanols, vitamins and nutrients.

But there are lesser-known reasons you should indulge in the (bitter)sweet stuff. Dark chocolate has been scientifically proven to keep your brain sharp, your ticker ticking and your skin shielded from the sun’s harmful rays (yes, really). Dark chocolate can be the key to beating that midday slump, accoriding to a new study from Northern Arizona University found.

Here's how dark chocolate can boost your health.