Video·3 min read·May 2026

Understanding the Role of Sauna in Glycemic Control: Insights from Recent Research

Sauna • 3 min read • Based on research by Laura Schenaarts, Floris K Hendriks, Cas J Fuchs, Wendy EM Sluijsmans, Tim Snijders, Luc JC van Loon (2024)

Many of us seek ways to enhance our well-being, often exploring methods that promise to improve health metrics like blood sugar levels. Among these, sauna therapy has gained popularity, especially with claims of benefits for conditions such as type 2 diabetes mellitus (T2DM). But what does the science say about a single sauna session and its potential effects on glycemic control?

Recent research conducted by Schenaarts et al. delves into this question, offering valuable insights into how infrared sauna sessions impact blood glucose management. Understanding these findings can help us make informed decisions about our wellness rituals.

The Study: What Was Tested?

In a randomized controlled crossover trial, twelve participants with T2DM experienced two different conditions: one in a heated infrared sauna at 60 degrees Celsius and another in a thermoneutral environment at 21 degrees Celsius. After each session, participants underwent an oral glucose tolerance test to assess how their bodies handled blood sugar.

The results were illuminating. While body core temperatures and skin temperatures were significantly higher after the sauna session, there was no improvement in plasma insulin concentrations or overall insulin sensitivity. This suggests that a single sauna session does not enhance postprandial blood glucose handling in individuals with T2DM.

Understanding the Mechanism: Heat and Glycemic Control

At first glance, it might seem intuitive that heat exposure could help improve glycemic control, similar to the effects of exercise. When we engage in physical activity, our body temperature rises, heart rate increases, and blood flow to muscles improves, facilitating glucose uptake. This physiological response is why exercise is a recommended strategy for managing T2DM.

However, the study indicates that while passive heating, like that experienced in a sauna, does raise body temperature, it does not lead to the same improvements in insulin sensitivity or glucose management. In simpler terms, even though the sauna makes you feel warm and relaxed, it doesn’t provide the same benefits for blood sugar control as a workout does.

The Bigger Picture: Implications for Wellness Rituals

While this research suggests that a single infrared sauna session may not be an effective standalone strategy for improving glycemic control, it opens up discussions about the potential benefits of prolonged sauna use and other lifestyle interventions. The authors emphasize the need for further studies to explore how longer-term sauna practices might influence blood sugar levels.

Incorporating sauna sessions into a broader wellness protocol, alongside regular physical activity and balanced nutrition, could contribute to overall health. It’s about finding harmony in your rituals, allowing each practice to support your journey towards resilience and clarity.

Key Takeaways

A single infrared sauna session does not improve blood glucose management in individuals with type 2 diabetes.
While sauna therapy offers relaxation and other potential benefits, it should complement, not replace, established lifestyle interventions like regular exercise.
Further research is needed to understand the long-term effects of sauna use on glycemic control.

Based on: A Single Sauna Session Does Not Improve Postprandial Blood Glucose Handling in Individuals with Type 2 Diabetes Mellitus: A Cross-Over, Randomized, Controlled Trial
Laura Schenaarts, Floris K Hendriks, Cas J Fuchs, Wendy EM Sluijsmans, Tim Snijders, Luc JC van Loon (2024). Experimental and Clinical Endocrinology & Diabetes

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A Single Sauna Session Does Not Improve Postprandial Blood Glucose

What the Study Actually Found

Here's a finding worth sitting with honestly: not only did a single infrared sauna session fail to improve blood glucose handling in people with type 2 diabetes—the glucose response was measurably worse afterward. The incremental area under the curve for plasma glucose was higher in the heated condition than the thermoneutral control. Higher. Not unchanged. Not neutral. Moving in the wrong direction.

Twelve participants with established type 2 diabetes. Forty minutes at 60 degrees Celsius in an infrared sauna. Immediately followed by an oral glucose tolerance test. No difference in insulin concentrations. No difference in insulin sensitivity. And a glucose curve that trended higher, not lower.

This Isn't an Isolated Finding

What the authors don't bury in the abstract is that this result is consistent with every prior study using passive heating for glycemic control. Hot water immersion trials—which are the dominant modality in this literature—have also failed to produce improvements in postprandial glucose or insulin sensitivity after a single session. Infrared sauna was proposed as a more promising candidate because its waves penetrate deeper into tissue, theoretically reaching skeletal muscle and improving perfusion more effectively than surface-level heat. That hypothesis is reasonable. The data just didn't support it here.

So we have a coherent pattern across multiple modalities: acute passive heat exposure does not replicate the glycemic benefits of exercise. The physiological similarities are real—elevated heart rate, increased blood flow, higher sweat rates—but the mechanisms that matter for glucose metabolism aren't being triggered in the same way.

Heat can mimic exercise's cardiovascular footprint without matching its metabolic signature. Elevated temperature alone doesn't open the same glucose uptake pathways that muscle contraction does.

Where the Science Is Still Unsettled

The researchers are careful not to close the door entirely. This study tested a single session. It says nothing about chronic adaptation. The long-term sauna data—particularly from the Finnish cohort studies—shows profound cardiovascular and metabolic benefits that accumulate over years of regular use. It's entirely possible, and actually likely, that the mechanisms for glycemic benefit require repeated heat stress, adaptation over time, and the kind of cumulative vascular remodeling that a single session simply cannot produce.

There's also the cortisol angle. Acute heat stress triggers a sympathetic response—adrenaline, norepinephrine, cortisol. That same stress response transiently raises blood glucose as part of the body's fight-or-flight preparation. So the slightly higher glucose curve post-sauna may not indicate a harmful effect so much as a temporary hormonal response that resolves within hours. The question is what happens to that curve over weeks and months of regular practice.

The Practical Recommendation

If you have type 2 diabetes and you're hoping a sauna session before meals will smooth your glucose response—the evidence says it won't. Not acutely. Don't use it as a substitute for the interventions that do work: structured exercise, dietary discipline, medication adherence.

But don't abandon sauna either. Use it for what the long-term data supports—cardiovascular resilience, heat shock protein activity, stress regulation, mood. Those benefits are real and well-documented. Just don't ask sauna to do a job that belongs to exercise.

The Insight Worth Carrying

What this paper quietly reveals is how specific biological mechanisms actually are. We often assume that if two interventions produce similar surface-level responses—heart rate up, temperature up, sweat flowing—they must be producing similar benefits. They don't. Muscle contraction during exercise activates GLUT4 translocation through pathways that passive heat simply doesn't reach. The body knows the difference between effort and warmth. Respecting that distinction is the beginning of designing protocols that actually work.

A Single Sauna Session Does Not Improve Postprandial Blood Glucose

Understanding the Role of Sauna in Glycemic Control: Insights from Recent Research

The Study: What Was Tested?

Understanding the Mechanism: Heat and Glycemic Control

The Bigger Picture: Implications for Wellness Rituals

Key Takeaways

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