The 9 "Zero-Calorie" Drinks That Still Wreck Your Blood Pressure Numbers

5. Diet Dr Pepper

Diet Dr Pepper blends classic flavors and a cult following with an ingredient list that includes aspartame and, in some versions, Ace-K. These sweeteners give a soda-like experience without the calories but don’t spare your blood pressure the hidden stress. Medical experts say that artificial sweeteners can trigger changes in tiny blood vessels, making them less responsive and giving your heart a little more work to do each day. Excess sodium, while not obvious on the label, may add up with regular consumption—especially for those watching their salt intake. Despite its reputation as a “smarter” soda, Diet Dr Pepper isn’t immune from the risks connected to metabolic syndrome or kidney-related blood pressure issues. If it’s your favorite fizzy fix, try savoring a smaller glass rather than defaulting to another refill. Remind yourself: supporting your heart is always a worthwhile habit.

6. Sugar-Free Red Bull

Sugar-Free Red Bull might promise an energy boost with no calories, but that rush comes at a cost not always highlighted in ads. Caffeine levels are high enough in even a single can to send your blood pressure upward for hours, putting extra strain on arteries and your heart. The drink also uses aspartame and Ace-K, sweeteners linked with kidney function decline and metabolic risk factors. What’s more, combining caffeine and artificial sweeteners can have unpredictable effects—some people see sharper blood pressure spikes, especially if those drinks aren’t balanced with enough water or movement during the day. Studies on energy drinks find connections between frequent consumption and cardiovascular incidents, including arrhythmia and hypertension. If you reach for Sugar-Free Red Bull on tired afternoons, it’s easy to understand why. Just remind yourself: steady energy and steady blood pressure are long-term allies, and there are gentler ways to keep both in balance.