Dark Chocolate May Not Always Be Good For Your Heart

Startling.

"Dark chocolate is rich in calories, so in order to gain any health benefit from flavenol-rich dark chocolate, you would have to reduce your intake of other foods to balance the calories. The editorial warns, 'The devil in the dark chocolate is the fat, sugar, and calories it contains.'"

Now how is it possible that a high-Calorie, high fat food could not always be good for your heart?