Ahh, chocolate. There probably isn't a more magical ingredient on earth than the sweet, dark brown flavoring used for more than 3,000 years. Today most chocolate is consumed in the form of candy. Common sense tells us that too much of something so fatty and full of calories is a bad thing. But a surprising number of studies have found that dark chocolate can reduce the risk of death from a heart attack, decrease blood pressure and help those with chronic fatigue syndrome. The question for many chocolate lovers has been at what point are you having too much of a good thing. That is, is there an optimal dose" for chocolate eating? A new study published in the journal Heart on Monday looked at the effect of diet on long-term health. It involved 25,000 volunteers and found that the answer to how much chocolate can be good for you is - a lot. Those who ate 15 to 100 grams of chocolate a day in the form of everything from Mars bars to hot cocoa had lower heart disease and stroke risk than those who did not consume the confection. The study also noted that more of the participants in the study ate milk chocolate vs. dark chocolate which has long been considered healthier. This might suggest that beneficial health effects may apply to both, the researchers said.