Zevia is fully compatible with a ketogenic diet. A 12-ounce can contains zero calories and roughly 4 grams of total carbohydrates on the label, but those carbs come from erythritol and stevia, neither of which your body metabolizes for energy. The effective net carb impact is essentially zero.
What’s Actually in a Can of Zevia
Zevia is sweetened with two ingredients that matter for keto: stevia leaf extract and erythritol. There’s no sugar, no aspartame, and no sucralose. The carbonated water, natural flavors, and citric acid round out a short ingredient list. Because erythritol is technically a carbohydrate, it shows up on the nutrition label, but it behaves nothing like sugar once you drink it.
Why Erythritol Doesn’t Count as a Net Carb
Erythritol has a glycemic index of zero and an insulinemic index of just 2 (compared to 100 for glucose on both scales). About 90% of the erythritol you consume is absorbed into your bloodstream, circulated without being broken down, and excreted unchanged in your urine within 24 hours. The small amount that reaches your large intestine isn’t fermented by gut bacteria either. In studies using radiolabeled erythritol, researchers detected virtually no metabolic byproducts, meaning your body extracts no usable energy from it.
This is why most keto trackers and nutrition apps subtract erythritol from total carbs. If you’re counting macros, a can of Zevia contributes zero net carbs to your daily total.
How Stevia Affects Blood Sugar and Insulin
Stevia’s active compounds are diterpene glycosides, which your digestive tract can’t break down or absorb. A randomized controlled trial in type 2 diabetic patients found no significant changes in fasting blood sugar, insulin levels, or hemoglobin A1C after stevia use. In practical terms, stevia passes through your system without triggering the glucose or insulin spikes that would interfere with ketosis.
One nuance worth knowing: stevia may actually support insulin function in the presence of glucose by interacting with calcium channels in pancreatic beta cells. But this effect is glucose-dependent, so when you’re in a low-carb, low-glucose state (like ketosis), it’s not clinically relevant.
Will It Kick You Out of Ketosis?
Some keto forums warn that sweet-tasting drinks can trigger a “cephalic phase insulin response,” where your brain detects sweetness and tells your pancreas to release insulin preemptively. The research on this is more nuanced than the warnings suggest. Studies have found a weak, statistically significant cephalic insulin response to some artificial sweeteners (particularly sucralose) in a subset of people with overweight or obesity. But stevia specifically performed better: one trial found that stevia-sweetened preloads led to lower post-meal insulin levels compared to both aspartame and sucrose.
Even in cases where a small cephalic response was detected, it didn’t affect appetite or food intake at the next meal. For the vast majority of people, drinking a Zevia will not produce a meaningful insulin spike or disrupt ketosis.
Caffeine Content by Flavor
If you’re using Zevia as a soda replacement on keto, caffeine content varies quite a bit across flavors. Several varieties like Ginger Ale, Cream Soda, and Grape are caffeine-free. The caffeinated options break down like this:
- Mountain Zevia: 55 mg per 12 oz can
- Cola: 45 mg
- Dr. Zevia: 42 mg
- Cherry Cola: 38 mg
- Zevia Zero Sugar Energy: 120 mg
For context, a typical 12-ounce cola has about 34 mg of caffeine, so Zevia’s caffeinated flavors run slightly higher. The energy drink version delivers roughly the same caffeine as a strong cup of coffee. Caffeine itself doesn’t affect ketosis, but it’s useful to know if you’re managing intake from multiple sources throughout the day.
A Note on Erythritol and Heart Health
A 2023 study made headlines linking blood levels of erythritol to cardiovascular events, and more recent genetic research using Mendelian randomization has found modest associations between erythritol and increased risk of coronary heart disease, heart attack, and stroke. The odds ratios were statistically significant but small in absolute magnitude. No association was found with heart failure or diabetes.
This research is still early, and the amounts of erythritol in a can of Zevia are far smaller than the doses used in most studies. But if you’re drinking several cans a day over a long period, it’s worth keeping an eye on how this science develops. The findings haven’t prompted regulatory changes, but they’ve added a layer of caution to what was previously considered a completely inert sweetener.
Dental Benefits Over Regular Soda
One underrated advantage of Zevia on keto: it’s non-cariogenic, meaning it doesn’t promote tooth decay the way sugar-sweetened sodas do. Pure stevia and erythritol both lack the fermentable sugars that oral bacteria feed on to produce enamel-damaging acid. Lab studies show that pure stevia reduced lactic acid production by 92% compared to sucrose. Some commercial stevia products do contain hidden fillers like lactose that can be just as cavity-promoting as sugar, but Zevia’s formulation uses stevia extract and erythritol without those fillers. The citric acid in Zevia can still soften enamel temporarily, so rinsing with water after drinking is a reasonable habit.