The reasons you break out when you eat chocolate and fast foods is because of the raging hormones that made you eat those foods in the first place.
Some of the ingredients in pure chocolate that might exacerbate acne are caffeine and its cousin theobromine, which is known to have pore-clogging properties, Caperton tells WebMD.
When you have out of control hormones your glands will become overactive causing more Acne, oil and breakouts. You can see now why chocolate gets the blame.