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People who drink moderate amounts of coffee-no more than 5 cups per day-are less likely to die from type 2 diabetes, heart disease, or neurological diseases compared to people who don’t indulge in the brew. That’s the conclusion of a 30-year study of more than 200,000 doctors and nurses, published in the American Heart Association journalCirculation. Both regular and decaf coffee had the same effects. “Bioactive compounds in coffee reduce insulin resistance and systemic inflammation,” says Ming Ding, MD, the study’s lead author.