The conclusion comes from a new scientific statement the AHA published July 20 in its flagship journal, Circulation, reviewing the accumulated evidence on caffeine, coffee and heart health. "There's what's called a J-curve hypothesis, meaning you don't get the benefit from coffee unless you consume moderate amounts of coffee," Gudimetla said. "You won't get enough sleep at night and we know that cardiovascular health benefits are seen with good sleep." What You Add to Your Coffee MattersThe reported benefits appear tied specifically to black coffee rather than more elaborate coffee drinks. "Adding sugar, flavored syrups, additional dairy products could increase your caloric intake and therefore counteract the potential health benefits associated with coffee itself," he said.