Another key concern for fasters is insulin. Some rodent studies suggested stevia might stimulate insulin release, but most human trials show minimal to no effect. A 2019 review in Nutrients concluded that stevia is essentially neutral when it comes to insulin secretion in healthy adults.
For people fasting primarily to burn fat or manage insulin resistance, this is good news. Any effect stevia has on insulin is too small to interfere with fat burning or ketosis.
Stevia and Autophagy
Autophagy — the body’s process of breaking down and recycling old or damaged cells — is one of the most exciting areas of fasting research. Unfortunately, there are no direct human studies on stevia and autophagy.
Because autophagy is highly sensitive to nutrient signals, some experts suggest avoiding all sweeteners if your fasting goal is maximum cellular repair. Others argue that because stevia has no calories and no known effect on nutrient-sensing pathways, it’s unlikely to interfere.
For now, the cautious approach is:
- Everyday intermittent fasting: Stevia is safe.
- Strict longevity fasts (48–72 hours): Stick with plain water, black coffee, or unsweetened tea.
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