The sweetener tied to a 57% higher heart attack rate

September 2, 2026 11 min read

Infographic, The sugar-free sweetener tied to a 57 percent higher rate of heart attack and stroke: xylitol as the bulk base of keto baked goods, protein bars, zero-sugar chocolate and diet ice cream, a 30 gram erythritol drink sending blood polyols more than a thousandfold above fasting levels, platelets loosening their calcium lid to release serotonin and CXCL4, brain vessel cells losing nitric oxide output, and the 17,710 person cohort with 57 percent more cardiovascular events over six years

Straight to what to do

How to handle xylitol The one-page recap

TL;DR

A study tracked 17,710 people for years, checking blood xylitol: the high end carried a 57 percent higher cardiovascular event rate over six years in one cohort, and 18 percent higher over thirty years of follow-up in the other.
Xylitol does not spike blood sugar or insulin the way table sugar does, but it still gets absorbed and circulates at real concentrations, where it reaches platelets and the blood vessel wall directly.
A 30-gram erythritol drink sent blood levels up more than a thousandfold, and that concentration loosened the calcium lid that keeps platelets calm, triggering the release of serotonin and the clotting protein CXCL4.
The big cohort numbers come from a conference presentation, not yet a peer-reviewed paper, and blood was measured, not diet, so cause and effect isn't settled.
The practical step needs no new research: the sweetener is optional, the products carrying it are labeled, and ordinary sugar, honey, maple syrup and ripe fruit supply sweetness the body handles as carbohydrate.

Key facts

57 percent higher cardiovascular event rate over six years in one 17,710-person cohort, 18 percent higher over thirty years in the other.
Elevated fasting xylitol carried a 1.57 hazard ratio for heart attack, stroke, or death within three years in cardiac patients; erythritol carried 1.80 and 2.21 in two separate groups.
The 30-gram erythritol dose raised blood levels from about 3.75 micromoles per liter to a peak of 6480.
One study found blood erythritol running 15 times higher in people carrying more body fat, and 21 times higher in those with elevated blood sugar.

A study tracked 17,710 people for years, checking how much of it was in their blood. The ones on the high end had far more heart attacks and strokes.

That substance is xylitol, the sugar substitute behind sugar-free gum and mints, and the bulk sweetening base of keto baked goods, low-carb protein bars, zero-sugar chocolate, and diet ice cream. Its selling point is real: it doesn't spike blood sugar or insulin the way table sugar does, because the body doesn't run it through the same pathway.

Food companies built an entire category on that one fact. No insulin spike got read as safe, and those bulk products started carrying tens of grams of it per serving. Skipping the insulin spike never meant skipping the bloodstream. Xylitol still gets absorbed and circulates at real concentrations, where it reaches platelets and the blood vessel wall directly.

What did the controlled dosing show?

Healthy volunteers drank a beverage with 30 grams of either erythritol, a closely related sugar alcohol, or plain glucose. The erythritol dose sent blood levels up more than a thousandfold above a normal fasting level, from about 3.75 micromoles per liter to a peak of 6480. The glucose dose raised no blood polyols, triggered no platelet activation, and released none of the clotting compounds platelets store.

That platelet activation is the mechanism researchers were checking for. Platelets normally keep a tight lid on their internal calcium, which is what keeps them calm until a real injury calls for clotting. The concentrations produced by that single dose of erythritol loosened that lid, triggering platelets to release serotonin and a clotting protein called CXCL4, the same signals they release at a wound. Xylitol, tested separately, raised several other measures of platelet activity the same way. In cells taken from the small blood vessels of the human brain, that same concentration of erythritol sitting in a dish for three hours raised oxidative stress and cut the vessel lining's output of nitric oxide, the signal that normally keeps blood vessels relaxed and keeps the clot-dissolving system switched on.

How strong is the human evidence?

That mechanism lines up with what researchers had already found in people already being evaluated for heart problems: elevated fasting xylitol in their blood carried a 1.57 hazard ratio, a measure of how much more likely an event was in that group, for a heart attack, stroke, or death within three years, and elevated erythritol carried hazard ratios of 1.80 and 2.21 in two separate patient groups. The new 17,710-person study is a different kind of evidence, drawn from the general public instead of cardiac patients and tracked for years instead of months. Instead of a hazard ratio, it found a 57 percent higher cardiovascular event rate in one cohort over six years, and an 18 percent higher rate, over thirty years of follow-up, in the other.

A separate, smaller trial found the opposite in one respect: four weeks of erythritol in people with type 2 diabetes improved a measure of blood vessel function and lowered central blood pressure, though it was a small, industry-supported pilot with no control group. Blood levels of these compounds have another source besides diet. The body makes small amounts of the same molecules on its own when cells are under metabolic stress. One study found blood erythritol running 15 times higher in people carrying more body fat, and 21 times higher in those with elevated blood sugar. Some of what shows up as high blood xylitol in the big cohort study may be the body's own signal of strain as much as the sweetener itself.

What are the limits of this evidence?

The big cohort numbers come from a conference presentation, not yet a published, peer-reviewed paper, and they're observational: blood was measured, not diet, so cause and effect isn't settled. The hazard ratios from cardiac patients came from people already sick enough to be under heart evaluation, not the general population. The platelet and blood vessel findings come from single large doses and lab dishes, not years of ordinary sugar-free gum use.

The practical step needs no new research: this sweetener is optional, and the products carrying it are labeled. Ordinary sugar, honey, maple syrup and ripe fruit supply sweetness the body handles as ordinary carbohydrate, not as a foreign circulating load. Anyone who has to avoid sugar, for a health condition or a doctor's instruction, or who avoids it by choice on a diet like keto, should know which products carry xylitol, and choose the ones without it.

The full practice, which labels carry it, the dose that causes stomach trouble, and the swaps for those who do eat sugar, follows below, with everything condensed into bullet points at the end.

How to handle xylitol: the action plan

What replaces them

Ripe fruit, fresh orange juice, raw honey, maple syrup, and ordinary white sugar supply sweetness the body handles as ordinary carbohydrate, not as a foreign circulating load. Pairing any of them with some protein or fat keeps the sugar hit steady rather than sharp. These are the swaps for anyone who already eats sugar and would rather keep doing that than reach for a sugar alcohol.

The labels worth a second look

Xylitol, erythritol, maltitol, and polyol blends show up as the bulk sweetening base in keto baked goods, low-carb protein bars, zero-sugar chocolate, and diet ice cream, usually in amounts of tens of grams per serving. Checking the ingredient list on these specific categories, rather than trusting a sugar-free front label, is what actually finds them.

Supporting the body's own processing

The body makes its own small amount of these same polyols when cells can't fully burn glucose and shunt the extra into a backup pathway instead. Thiamine, magnesium, and potassium, from foods like orange juice, mineral water, cooked egg yolks, and well-cooked root vegetables, support the main pathway glucose is supposed to run through, which is the more direct way to keep that backup pathway from running as hard.

Recovering from a rough reaction

Separate from the blood vessel story, single doses of 35 or 50 grams of xylitol in one sitting reliably cause cramping, bloating, and watery diarrhea, an old and well-documented reaction tied to how much unabsorbed sugar alcohol reaches the gut at once, not to the newer heart findings. For that cramping and watery diarrhea, warm bone broth, gelatin, stewed peeled apples, and boiled peeled potatoes are gentle enough to rebuild the gut lining while it settles, with raw vegetables and bran better left out until symptoms pass.

The oral-care exception

Xylitol's benefit against the bacteria that cause cavities is a surface effect, on the teeth themselves, and that part of the case is real. Toothpaste and other products that stay in the mouth and get spit out, rather than swallowed, keep that benefit without adding to what circulates in the blood. A baking soda rinse, a spoonful in warm water after meals, and oil pulling with coconut oil are swallow-free alternatives for the same goal. Gum is the one product in this group that does get partly swallowed: a piece carries at most about a gram of xylitol, often less, swallowed slowly across the whole chew, nowhere near the thirty-gram drink that surged through blood in the trial.

The one storage note

Xylitol is fatal to dogs in amounts far smaller than what a person tolerates, triggering a genuine insulin surge and liver failure in a dog's body chemistry. Any xylitol product in the house is safest stored the way a medication would be, out of reach.

The one-page recap

Ripe fruit, orange juice, raw honey, maple syrup, and ordinary sugar supply sweetness the body handles as ordinary carbohydrate, not as a foreign circulating load, best paired with protein or fat to keep the sugar hit steady.
Xylitol, erythritol, maltitol, and polyol blends are the bulk sweetener base in keto baked goods, protein bars, sugar-free chocolate, and diet ice cream. Checking the ingredient list, not the sugar-free label, is what finds them.
Thiamine, magnesium, and potassium from orange juice, mineral water, egg yolks, and root vegetables support the body's main glucose pathway.
A single 35 or 50 gram dose of xylitol reliably causes cramping, bloating, and watery diarrhea, separate from the heart findings entirely. Bone broth, gelatin, stewed peeled apples, and boiled peeled potatoes are gentle recovery foods for it.
Xylitol toothpaste and other spit-out oral products keep the dental benefit without adding to blood levels. Baking soda rinses and coconut oil pulling are swallow-free swaps.
Xylitol is fatal to dogs in small amounts and belongs stored out of reach.

Anyone using sugar-free products on a doctor's advice to manage blood sugar is the one group who should check with that same doctor before changing what they reach for instead, so the change doesn't undo the reason the products were recommended in the first place.