Does a Single Sauna Session Help Blood Sugar in Type 2 Diabetes? A Randomized Trial Says No

Sauna use is often discussed as a tool for metabolic health, but the honest evidence needs to be tested one claim at a time. This trial looked specifically at whether a single sauna session changes how the body handles blood sugar after a meal — and it found that it doesn't.

What the research looked at

Published in Experimental and Clinical Endocrinology & Diabetes in 2024, this randomized, controlled, cross-over trial enrolled 12 older adults with type 2 diabetes. Each participant completed two sessions on separate days, in randomized order: one 40-minute infrared sauna session at 60°C, and one thermoneutral (21°C) control session. Immediately afterward, participants underwent a standard 2-hour oral glucose tolerance test, and researchers tracked how their blood glucose responded.

What they found

Postprandial (after-meal) blood glucose handling did not differ significantly between the heated sauna session and the thermoneutral control session. A single sauna session did not measurably improve how participants' bodies processed glucose after eating.

What this means in practice

This is a small trial (12 participants) testing a single session, not a program of regular sauna use over weeks or months — so it doesn't rule out longer-term metabolic benefits that other observational research has suggested. What it does show is that sauna bathing isn't a quick fix for blood sugar control around a meal, and it shouldn't be used as a substitute for standard diabetes management, medication, or diet. People with type 2 diabetes who enjoy sauna bathing can likely continue safely, but shouldn't expect it to replace glucose-lowering treatment.