Episode Details

New research from the American Heart Association says up to five cups of plain black coffee a day—about 400mg of caffeine—is generally safe and may even lower heart disease risk for most adults. But beware: energy drinks and extreme caffeine doses can disrupt heart rhythm, even in healthy young people. The study also notes it’s hard to isolate coffee’s effects when mixed with sugar, milk, and syrups. If you have existing heart conditions or are at risk, stay cautious. Your daily brew is likely fine—but watch out for super-caffeinated drinks and listen to your body.

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