Managing coronary artery disease (CAD) often involves careful attention to diet, and what you drink matters just as much as what you eat. While a glass of water or unsweetened tea supports heart function, certain beverages can strain your arteries, raise blood pressure, or add empty calories that contribute to plaque buildup. The goal isn't to eliminate enjoyment, but to understand which drinks may quietly worsen your condition and how to adjust accordingly.
Below, we examine three categories of beverages that people with CAD should consider limiting. Each has a clear mechanism linking it to cardiovascular stress, and small swaps can make a significant difference over time.
Sugary Sodas and Sweetened Soft Drinks
Regular sodas and fruit drinks with added sugar are essentially liquid sugar. A single 12-ounce can of cola contains about 39 grams of added sugar—roughly 10 teaspoons. For someone with CAD, the problem is twofold: the rapid spike in blood sugar triggers inflammation, and the excess fructose (common in high-fructose corn syrup) can increase triglycerides and promote fat deposition in the liver and arteries.
Research published in the Journal of the American College of Cardiology found that individuals who consumed sugary drinks daily had a 20% higher risk of coronary heart disease compared to those who rarely drank them. This risk is independent of other dietary factors, meaning even if your diet is otherwise heart-healthy, frequent soda consumption can undermine your vascular health.
What to do instead: Switch to sparkling water with a squeeze of lemon or lime, or try unsweetened iced tea. If you crave sweetness, start by mixing half soda with half sparkling water to gradually reduce intake.
Alcoholic Beverages (Especially Beer and Mixed Drinks)
The relationship between alcohol and heart disease is nuanced, but for those with established coronary artery disease, the safest advice is to limit consumption significantly. Alcohol can raise blood pressure, contribute to irregular heart rhythms (atrial fibrillation), and add empty calories that make weight management harder.
The American Heart Association recommends that if you drink alcohol, limit intake to no more than one drink per day for women and two for men, but for individuals with CAD, even lower amounts may be prudent depending on medications and overall health.
Beer and sugary cocktails are particularly problematic. Beer is high in carbohydrates, which can raise triglycerides, while mixers like juice or soda add sugar. Red wine is sometimes touted for its antioxidant resveratrol, but the evidence that moderate wine consumption protects against heart attacks in people who already have CAD is inconsistent and weak.
A safer approach: If you choose to drink, stick to a single serving of dry red wine or spirits with a calorie-free mixer, and always discuss your alcohol habits with your cardiologist, especially if you take blood thinners or blood pressure medications.
Energy Drinks and Highly Caffeinated Beverages
Energy drinks like Red Bull, Monster, and 5-hour Energy are not just high in caffeine—they often contain taurine, guarana, and other stimulants that can increase heart rate and blood pressure. For someone with narrowed coronary arteries, this added stress can reduce oxygen supply to the heart muscle and trigger chest pain (angina) or even a heart attack.
A 2019 study in the Journal of the American Heart Association demonstrated that consuming just one energy drink increased blood pressure and norepinephrine levels (a stress hormone) in healthy adults. The effects were even more pronounced in those with underlying heart conditions. Large doses of caffeine from coffee or strong tea can similarly cause palpitations and raise blood pressure, though the risk is lower than with energy drinks.
What to consider: Limit caffeine to 200–300 mg daily (about two small cups of coffee). Avoid all energy drinks. If you need a pick-me-up, try a short walk, a protein-rich snack, or a decaffeinated green tea, which provides gentle alertness without overstimulating your heart.
By making these three adjustments, you reduce daily stress on your coronary arteries, help manage blood pressure, and support stable blood sugar levels. Small changes in what you drink can compound over weeks and months, giving your heart a real chance to work more efficiently with less plaque-related risk.
