Even a little causes problem, but it would be also difficult to have just a little once in a while. It is more difficult, if I could, to just have once in a while. Hey! I want at least an ounce of dark chocolate a day but makes my skin itch like crazy. Once I get the taste buds going, I want it every day. And I am not overweight, but easily becomes a craving for me. But not worth arrythmia or itching half the night.