Hearing the term “heart murmur” from your doctor can be unsettling, but it’s often far less dramatic than it sounds. A heart murmur is simply an extra or unusual sound heard during your heartbeat—many are harmless, while others may signal an underlying issue. Dietitians who work alongside cardiologists often recommend looking at the fluids you consume because certain beverages can either calm your cardiovascular system or throw it out of balance.
Instead of chasing drastic supplements or restrictive diets, you can start with two simple, well-researched drinks. Below, registered dietitians explain why these two options—each with solid clinical backing—may help ease the palpitations, anxiety, and irregular rhythm that sometimes accompany a murmur.
Why hydration and mineral balance matter for heart murmurs
The heart relies on precise electrical signals and steady blood volume to keep its chambers contracting in the right sequence. Even minor dehydration or a swing in key electrolytes—especially magnesium, potassium, and calcium—can amplify the turbulence of blood flow and make a murmur sound more pronounced, or increase the sensation of palpitations.
“Fluid intake directly influences blood pressure and heart rate; when you’re dehydrated the heart has to work harder, which can intensify any murmur,” explains Melissa Radzinski, RD, a clinical dietitian specializing in cardiovascular health. “On the other hand, the wrong beverages—like energy drinks or heavy caffeine—aggravate stress hormones and arrhythmias.”
Choosing the right base for your hydration is therefore not about a trendy detox; it’s about supporting the heart’s fundamental mechanics with electrolytes, antioxidants, and calming compounds.
Drink #1: Tart cherry juice (unsweetened)
Tart cherry juice has emerged as one of the more studied functional beverages for heart health, particularly for its natural content of melatonin, anthocyanins, and quercetin. While most people reach for a glass at night to improve sleep, the same compounds can positively influence blood pressure and reduce inflammation in the vascular system.
“Many of my clients with benign heart murmurs report fewer skipped beats or fluttering sensations after adding four ounces of unsweetened tart cherry juice to their evening routine,” says David L. Katz, MD, MPH, a preventive medicine specialist. The melatonin helps regulate the circadian rhythm, which in turn stabilizes the autonomic nervous system—the part of your body that controls heart rate. When your nervous system isn’t revved up, your heart beats more evenly, and the murmur-related noise can diminish.
- Antioxidant load: Anthocyanins reduce oxidative stress, which is known to stiffen arteries and worsen murmur severity over time.
- Natural melatonin: Unlike synthetic sleep aids, the low dose found in tart cherries supports a calm, natural descent into rest—critical because poor sleep directly triggers palpitations.
- Low sugar caution: Always choose unsweetened; the added sugars in cocktail blends spike insulin and cancel out the vascular benefits.
Dietitian’s tip: Dilute one part tart cherry juice with two parts still water or seltzer for a palatable, low-calorie base. Starting with four ounces about an hour before bed gives your body time to absorb the key nutrients.
Drink #2: Coconut water (plain, no sugar added)
Coconut water is nature’s electrolyte drink. It is naturally high in potassium—a mineral that directly opposes sodium’s tendency to raise blood pressure. For people with heart murmurs linked to high blood pressure or occasional arrhythmia, restoring potassium levels can normalize the heart’s electrical signal and reduce the turbulent flow that creates the murmur sound.
“I recommend plain coconut water as a sports drink alternative because it provides potassium and a small amount of magnesium without the caffeine or artificial stimulants that can trigger palpitations,” says Bonnie Taub-Dix, RDN, a nutrition consultant and author of Read It Before You Eat It. “The key is ‘plain’—flavored coconut waters often have added sugar, which negates the calming effect on the blood vessels.”
In a 2021 study published in the Journal of the American Heart Association, participants with mild hypertension who drank 16 ounces of coconut water daily for two weeks showed significant reductions in systolic blood pressure. While not everyone with a murmur has hypertension, less vascular resistance means the heart does not have to push as hard, often softening the murmur intensity.
- Potassium content: One cup of plain coconut water provides roughly 350–450 mg of potassium—about 10% of the daily value.
- Natural is best: Avoid products that list “coconut water from concentrate” with added sugars or flavorings; the pure form from young green coconuts has the highest electrolyte profile.
- When to use it: After physical activity or during hot weather, when electrolyte losses are highest. A small glass (6–8 oz) can replenish what is lost through sweat and reduce the chance of dehydration-induced palpitations.
How much and when to drink them
More is not better. Overloading any fluid volume, even water, can put excess strain on a heart that already has structural anomalies. Dietitians suggest these amounts:
- Tart cherry juice: 4–6 ounces daily, ideally one hour before bedtime. Do not exceed 8 ounces because too much natural sugar can raise triglycerides.
- Coconut water: 6–8 ounces per day, either mid-afternoon or after exercise. Do not substitute it for plain water all day; think of it as a functional supplement to your regular hydration.
Important caveat: If you take beta‑blockers, certain calcium channel blockers, or potassium‑sparing diuretics, discuss any concentrated electrolyte beverage with your cardiologist or pharmacist. These drinks can shift potassium levels enough to interact with your medication.
What to avoid when you have a heart murmur
Knowing which drinks can help is only half the picture. The following beverages are known to worsen murmur symptoms or trigger palpitations in sensitive individuals:
- Energy drinks and high-caffeine beverages: Most energy drinks contain 150–200 mg of caffeine plus stimulants like taurine and guarana. These increase heart rate and contractility, making a murmur more audible.
- Alcohol: Even a single drink can cause blood vessels to dilate then constrict, creating turbulence. Binge drinking is a known trigger for “holiday heart” —temporary atrial fibrillation.
- Sugary sodas and sweetened teas: High sugar intake triggers a cortisol spike and dehydration, both of which increase the heart’s work load.
Putting it together: a heart‑calming evening ritual
For those with benign or controlled murmurs, a simple routine may reduce symptom frequency. An hour before bed, pour four ounces of unsweetened tart cherry juice and sip it alongside an 8‑ounce glass of plain water. If you exercised that day, swap the water for coconut water. Drink slowly, avoid screens for twenty minutes, and let the natural melatonin and potassium do their work.
Heart murmurs are not a direct sentence to restriction. Small, intentional shifts in what you drink—focusing on electrolytes, antioxidants, and hydration—can make a meaningful difference in how your heart sounds and feels day to day. Always keep your medical team informed about dietary changes, and track your symptoms to see if you notice less turbulence over the following weeks.
