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

7. Monster Energy Zero Ultra

Monster Energy Zero Ultra pours big flavor into a frosty white can, billing itself as the zero-calorie answer to full-sugar energy drinks. The label reveals a trio of sweeteners (sucralose, Ace-K, erythritol), plenty of caffeine, and a modest kick of sodium for taste. All these together can stress the cardiovascular system—a jolt of caffeine can raise your blood pressure in the short term, and artificial sweeteners add their own layer of vascular strain with heavy use. Sodium, even in small amounts, matters if you enjoy energy drinks often. Researchers have raised concerns about how these ingredients may interact, especially for people sensitive to blood pressure fluctuations or with a history of hypertension. The upside? You have choices. If Monster is part of your daily routine, alternate in caffeine-free or naturally sweetened options, keeping your energy—and pressure—on a more even keel.

8. Crystal Light Lemonade

Crystal Light Lemonade seems like a harmless way to enjoy fruity flavor with hardly any calories, especially compared to regular sodas or juices. But its convenience masks a long ingredient list—most notably, aspartame. Studies have shown that the kind of repeated intake many people develop can pose problems for blood vessel flexibility and prompt gradual kidney function decline, both of which influence blood pressure control over years. The powdered form means it’s easy to use more than the recommended serving, inadvertently increasing the amount of sweetener you’re taking in. Experts encourage label reading and keeping tabs on cumulative intake—especially since many of these additives also appear in yogurt, gum, and other diet foods. Crystal Light works well as an occasional treat, but it’s worth balancing with plenty of plain water and herbal infusions for true, feel-good hydration.