It's no secret that the unhealthy diet is contributing to an epidemic of obesity. But there's another hidden epidemic that our fatty diets are at the root of: a libido crisis. One of the big culprits, for both men and women, is obesity. As a person's weight soars, their libido plummets, due to biochemical changes that diminish blood flow.

The good news: With some simple changes to your diet, you can revitalize your relationship and dramatically improve your health.

Eat  DARK CHOCOLATE

Chocolate is full of anandamide and phenylethylamine, two compounds that cause the body to release the same feel-good endorphins triggered by sex and physical exertion. Cocoa also contains methylxanthines, which make skin sensitive to every touch. Aim for dark chocolate, which packs more cocoa than lighter milk chocolates, and keep portions small.

Skip WHITE CHOCOLATE

White chocolate isn't technically chocolate, since it doesn't contain any actual cocoa—which means no heightened skin sensitivity, or rush of the feel-good hormone serotonin.

Eat  HIGH PROTEIN FOOD

Meat Protein has been shown to naturally boost levels of dopamine and norepinephrine, two chemicals in the brain that heighten sensitivity during sex. Steak is  packed with zinc—a mineral that boosts libido by reducing production of a hormone called prolactin, which may interfere with arousal.

Skip AN ENERGY DRINK

Canadian scientists found that maintaining a diet high in sugar can temporarily lower your testosterone levels, which in turn can sap your sex drive—whether you're a man or a woman. See, the more testosterone you have, the higher your arousal levels. Too much sugar sends your T into hibernation—and your libido along with it.

Eat ICE CREAM

Ice cream has high levels of calcium and phosphorus, two minerals that build your muscles' energy reserves and boost your libido. All that calcium—200 milligrams in the typical bowl—can also make you more sexually charged, since the muscles that control sexual response need calcium in order to contract properly.

Skip TOMATOES

They're great for you in other ways, but tomatoes' lycopene and phytofluene can decrease testosterone levels. The effect isn't dramatic, but you may be better off skipping the marinara sauce if you want to get saucy.

Eat BLUEBERRIES

Forget Viagra. Mother Nature's original blue potency capsules may do even more for you. Blueberries also relax blood vessels and improve blood flow. For maximum potency and performance, eat a serving of blueberries at least three or four times a week.

Skip SODA

Soda pop will sap your sex drive. Too much sugar will lead to spikes and crashes in your blood glucose, ultimately sapping your testosterone levels (and your libido).