Are Artificial Sweeteners Bad for Your Heart? Here’s What the Evidence Says

If you’ve made the switch from sugar to artificial sweeteners, you were probably trying to do the right thing. Less sugar, fewer calories, better numbers. It’s a reasonable trade-off, and for years the message was clear: these products are safe, tested, and a smarter choice than sugar. But are artificial sweeteners bad for your heart? The science is getting more complicated.

A wave of research published in 2025 and 2026 has raised real questions about whether artificial sweeteners are as heart-neutral as once believed, and some of the findings are worth paying attention to if you’re managing blood pressure or cholesterol. This article breaks down what the current evidence actually shows, where the research is still unsettled, and what it means for your daily choices.

Why This Matters If You’re Managing Heart Health

Artificial sweeteners are everywhere. They’re in diet sodas, sugar-free yogurt, protein bars, chewing gum, flavored waters, and dozens of other products marketed to health-conscious adults. If you’re working to lower your blood pressure or LDL cholesterol, there’s a good chance you’re using them regularly under the assumption they’re a neutral or even helpful swap.

Researchers have been tracking large populations over years and running clinical trials to better understand what these sweeteners do inside the body. The picture that’s emerging isn’t as clean as the ‘zero calories, zero consequences’ framing suggests. This doesn’t mean artificial sweeteners cause heart disease. It means the evidence is more nuanced than has been communicated, and there are now enough signals in the research to warrant a closer look.

What the Research Shows

The research landscape on artificial sweeteners and heart health falls into two categories that don’t always agree: long-term observational studies and short-term clinical trials.

Observational Studies — Signals Worth Noting

Large population studies have produced some concerning patterns. A 2026 meta-analysis published in the journal Nutrition Research and Practice pulled data from 37 studies covering more than 3.6 million participants. Higher artificial sweetener intake showed increased risk of hypertension (high blood pressure), heart failure, and stroke. A French cohort study followed more than 103,000 adults over more than a decade. Higher consumers of aspartame and acesulfame potassium had elevated rates of cardiovascular and cerebrovascular disease compared to non-consumers.

Two specific sweeteners have drawn particular attention. Erythritol, a sugar alcohol widely used in keto and low-sugar products, showed a higher risk of heart attack and stroke in research published in Nature Medicine. And a study presented at ESC Congress 2026 in August found that high blood levels of xylitol, another sugar alcohol commonly found in sugar-free gum, mints, and oral care products, showed an association with major adverse cardiovascular events.

Researchers at Tufts University published a 2026 meta-analysis of 21 randomized clinical trials. Artificial sweeteners raised both fasting insulin levels and long-term blood sugar markers compared to plain water or a placebo. Keep in mind that elevated insulin and blood sugar are themselves cardiovascular risk factors.

Where the Evidence Gets Complicated

Not all research points in the same direction. A separate 2025 meta-analysis of nine randomized controlled trials found no statistically significant differences in total cholesterol, LDL, HDL, triglycerides, systolic blood pressure, or diastolic blood pressure between people consuming artificially sweetened beverages and those consuming unsweetened ones.

Observational studies track what happens in large populations over years, but they can’t prove cause and effect. People who use a lot of artificial sweeteners may also have other habits that contribute to cardiovascular risk. Short-term clinical trials control for those variables more tightly but may not capture what happens over years of use.

The research doesn’t give a clean verdict either way. What the research does show is that artificial sweeteners are not neutral inside the body. They interact with insulin response, gut bacteria, and blood vessel function. Researchers are still working to understand exactly how.

What This Means Practically

There is no need to panic if you’ve been using Splenda in your coffee or drinking a daily Diet Coke. What it does mean is that artificial sweeteners probably shouldn’t be treated as a free pass, particularly if you’re actively managing cardiovascular risk.

The 2025-2030 Dietary Guidelines for Americans reflect the shift in thinking. The guidelines state that no amount of non-nutritive sweeteners is recommended or considered part of a healthy or nutritious diet, and encourages moving away from both sugar-sweetened and artificially sweetened beverages alike.

Practical Steps for People Managing Blood Pressure and Cholesterol

Cutting back on artificial sweeteners doesn’t mean going back to sugar. Here are specific, manageable alternatives.

Switch your beverage. Plain sparkling water, flavored sparkling water with no sweeteners added, or unsweetened herbal tea are the cleanest swaps for diet soda. If you need something slightly sweet, a small splash of 100% fruit juice in sparkling water gives flavor without artificial additives.

Read labels on “sugar-free” products. Erythritol and xylitol appear in many products marketed as healthy, including protein bars, sugar-free candy, and low-carb baked goods. Check the ingredient list, not just the front of the package.

Use small amounts of real sugar where it matters most. A teaspoon of sugar in your morning coffee is roughly 16 calories. For most people managing heart health, that’s a far smaller concern than three packets of Splenda, two diet sodas, and a sugar-free snack bar before dinner.

Don’t replace sweeteners with refined carbohydrates. If cutting diet soda leads to more juice, sweetened coffee drinks, or processed snacks, the trade-off isn’t actually better. The goal is less sweetness overall, not just a different source of it.

Frequently Asked Questions

Are artificial sweeteners bad for your heart?
The evidence is mixed but increasingly cautionary. Large observational studies have linked higher artificial sweetener consumption to elevated risks of hypertension, heart failure, and stroke. Some short-term clinical trials show no significant effect on blood pressure or cholesterol. The research raises real concerns, though it hasn’t proven that artificial sweeteners directly cause heart problems.

Which artificial sweeteners are most concerning for heart health?
Recent research has focused particularly on erythritol and xylitol, both sugar alcohols found in many low-sugar and keto-friendly products. Aspartame and acesulfame potassium have also been linked to elevated cardiovascular risk in large cohort studies.

Does diet soda raise blood pressure or cholesterol?
Short-term clinical trials have not found a direct effect on blood pressure or cholesterol from artificially sweetened beverages. However, long-term observational data suggests associations with hypertension and cardiovascular events. The discrepancy likely reflects that short trials can’t capture the effects of years of regular use.

What does the 2025 Dietary Guidelines say about artificial sweeteners?
The 2025-2030 Dietary Guidelines for Americans state that no amount of non-nutritive sweeteners is recommended or considered part of a healthy or nutritious diet, and encourages avoiding both sugar-sweetened and artificially sweetened beverages.

What are the best alternatives to artificial sweeteners?
Plain or flavored sparkling water with no sweeteners added, unsweetened herbal tea, and small amounts of real sugar used intentionally are the most practical alternatives. The goal is reducing overall sweetness dependence rather than simply swapping one sweetener for another.

Should I stop using artificial sweeteners completely?
The research doesn’t support an all-or-nothing recommendation. What it does support is reducing reliance on artificially sweetened products as a category, particularly diet beverages and products sweetened with erythritol or xylitol, and working toward less sweetness overall.

The Bottom Line

Are artificial sweeteners bad for your heart? No definitive verdict, but the research has shifted in the past two years. The signals from large-scale studies are consistent enough that treating these products as completely harmless is harder to justify than it once was, especially for anyone managing blood pressure or cholesterol.

The practical takeaway: move toward less sweetness overall rather than searching for a substitute. Water, sparkling water, and unsweetened beverages are the best choices.

If managing blood pressure is a priority for you, the free e-course, 7 Natural Ways to Lower Blood Pressure, covers the specific dietary strategies with the strongest evidence behind them.

All the best,
Lisa Nelson RD