Recent findings from the AHA say that drinking up to five cups of coffee a day is safe for most adults and may even have some benefits. The AHA says regular coffee consumption may be linked to a lower risk of stroke, diabetes, and heart failure, but how you brew your coffee matters. But the report warns that not all caffeine is created equal—distinguishing between regular coffee and highly concentrated synthetic caffeine, seen in products like energy drinks or shots. She says limiting synthetic caffeine is important, noting potential side effects like tachycardia, anxiety, and not being able to sleep. This guidance says up to five cups of coffee is safe for most adults, but Dr. Battjes says everyone reacts differently to caffeine.