A cup of coffee or two (or three) in the morning is one of the most common pleasures of the modern world. But how guilty should we feel about indulging in it?A new scientific statement by the American Heart Association (AHA) may have an answer.The team behind the statement gathered the most recent health data on caffeine, from a series of existing studies that examined the drug's effects on various outcomes, such as blood pressure and cholesterol, and the risks of metabolic and cardiovascular diseases.In short: Go ahead and enjoy it! The review found that for most people, a couple of cups of Joe aren't likely to do any harm, and may even be good for you. There are a few major caveats, of course. As with most things, moderation is key, and any benefits can be canceled out as soon as you add cream, sugar, sweeteners, flavored syrups, or other things to your java.The source of your caffeine is important, too. Coffee and tea can provide other antioxidants and compounds that contribute to benefits. Energy drinks, on the other hand, can contain too high a dose of caffeine, not to mention the sugar and other unhealthy ingredients."Caffeine consumed in coffee is a key part of daily life for millions of people," says Gregory Marcus, cardiologist at the University of California, San Francisco, and Chair of the AHA volunteer writing group behind the statement."In our review of the most recent research, for most adults, intake of up to 400 milligrams of caffeine per day, the equivalent of up to five cups of caffeinated coffee per day without added sugars or fillers, is safe and does not increase cardiovascular risk."