Caffeine is also bad for your skin because it impedes your blood circulations. Skin requires a regular blood supply to stay looking young and healthy. A lack of oxygen can lead to dark circles, puffiness, fine lines, poor color. You know how your face looks after to many espressos and a few late nights … well, the skin on your behind is also being robbed of vital nutrients, too, which means it’s going to look dry and dehydrated—and that will make your cellulite worse.

Caffeine also contributes to water retention; as it’s a diuretic, it can dehydrate your body. When you’re dehydrated, cells hold on to water—and your fat cells hold on to fluids, which, on your bottom and thighs, makes your skin bulge out and look puffier and more dimply.

And if that hasn’t put you off the black stuff, bear in mind that it’s also no friend if you’re a PMS sufferer. That’s because caffeine increases sleeplessness, anxiety and tension, which are symptoms of PMS. A study of over 200 college-age women found severe PMS symptoms in 60 percent of those who drank more than four cups of caffeinated drinks a day. Coffee also causes your body to get rid of important nutrients, especially B vitamins, which are needed for energy, good skin and hair, healthy growth, and mood.
It gets worse. Caffeine also destroys calcium—one cup of coffee removes about six milligrams of calcium form your body’s stores. Experts have found that calcium is important in weight loss because it’s thought to help prevent fat storage and boost metabolism. (You can increase the calcium in your diet with skim milk, cheddar cheese, fish, sesame seeds and dried figs. Other good sources include steamed tofu and nuts.)