Using Saunas to Manage Diabetes: What the Research Actually Says

Diabetes management is a daily commitment — and for the more than 37 million Americans living with the condition, any tool that can meaningfully support blood sugar control, cardiovascular health, and quality of life deserves serious attention. Over the past two decades, a growing body of peer-reviewed research has begun to explore whether sauna therapy belongs in that toolbox.

The short answer: the science is promising, particularly for people with Type 2 diabetes. Regular sauna use has been linked to improved insulin sensitivity, reduced blood pressure, better circulation, lower systemic inflammation, and measurable improvements in quality of life — all of which are directly relevant to diabetes management. But the nuances matter. A single sauna session won't transform your blood sugar readings. The benefits emerge from consistent, repeated use over weeks and months, and certain precautions are essential for people whose diabetes affects nerve function, cardiovascular stability, or medication absorption.

This guide covers everything the research currently tells us about using saunas as a complementary strategy for diabetes management — the biological mechanisms at work, the clinical evidence behind the claims, which type of sauna may be best suited for people with diabetes, how to build a safe and effective routine, and what to discuss with your healthcare provider before you start.

How Diabetes Affects the Body — and Where Sauna Therapy Fits In

To understand why saunas may help with diabetes management, it helps to understand the core metabolic dysfunction that diabetes creates.

In Type 2 diabetes — which accounts for roughly 90–95% of all diabetes cases — the body's cells become increasingly resistant to insulin, the hormone that shuttles glucose from the bloodstream into cells for energy. The pancreas compensates by producing more insulin, but over time it can't keep up. The result is chronically elevated blood glucose, which damages blood vessels, nerves, kidneys, eyes, and the heart.

In Type 1 diabetes, the immune system destroys the insulin-producing beta cells in the pancreas. People with Type 1 diabetes depend on external insulin (injections or a pump) to survive. Their challenge isn't insulin resistance per se — it's managing precise insulin dosing to match their body's needs throughout the day.

Both forms of diabetes share a common set of complications that significantly affect quality of life: cardiovascular disease, peripheral neuropathy (nerve damage in the hands and feet), poor circulation, chronic inflammation, increased infection risk, slower wound healing, and persistent fatigue and stress. Sauna therapy, as we'll explore below, has documented effects on many of these pathways.

The Biological Mechanisms: How Heat Therapy Affects Blood Sugar and Insulin

When you sit in a sauna — whether it's a traditional Finnish sauna or an infrared sauna — your body undergoes a cascade of physiological responses that overlap significantly with the adaptations produced by moderate-intensity exercise. Understanding these mechanisms explains why researchers have become increasingly interested in sauna therapy as a complementary approach for metabolic conditions like diabetes.

Heat Shock Proteins and Insulin Signaling

One of the most important mechanisms linking sauna use to improved blood sugar control involves heat shock proteins (HSPs). These are specialized molecules that your cells produce in response to thermal stress. When your core body temperature rises during a sauna session, HSP production ramps up — particularly HSP70 and HSP72, which have been studied extensively in the context of metabolic health.

HSPs serve as cellular maintenance workers. They repair damaged proteins, protect cells from oxidative stress, and reduce chronic inflammation. In the context of diabetes, this matters enormously: chronic low-grade inflammation is one of the primary drivers of insulin resistance. Research published in Experimental Biology and Medicine has demonstrated that increased HSP expression is associated with improved insulin signaling pathways and better glucose uptake in skeletal muscle — the body's largest consumer of glucose.

Importantly, researchers have proposed that a progressive cycle exists in Type 2 diabetes: reduced intracellular HSP levels lead to increased inflammation, which independently impairs insulin signaling, which then further reduces HSP levels. Chronic passive heating through regular sauna use may break this cycle by directly improving inflammation status and restoring healthy HSP levels.

FOXO Proteins and Insulin Receptor Expression

Heat stress also activates a family of proteins known as FOXOs (Forkhead box O transcription factors). FOXOs are sometimes called "longevity genes" because of their role in DNA repair, immune function, stress resistance, and cellular housekeeping. For people with diabetes, their most relevant function is that they increase insulin sensitivity by inducing expression of the insulin receptor itself — essentially making cells more responsive to whatever insulin is available.

Animal studies have shown that whole-body hyperthermia applied three times per week over three months — a protocol comparable to regular sauna use — produced a 31% reduction in insulin levels in diabetic subjects while maintaining glucose control, suggesting that the body was using insulin far more efficiently.

Cardiovascular Conditioning and Blood Vessel Function

A sauna session raises your heart rate to roughly 100–150 beats per minute — comparable to a brisk walk or light jog. Blood vessels dilate, peripheral resistance drops, and blood pressure decreases both acutely and, with repeated exposure, chronically. A comprehensive review published in Mayo Clinic Proceedings described the cardiovascular responses produced during an ordinary sauna bath as comparable to those produced by moderate-intensity physical activity.

This matters for diabetes because cardiovascular disease is the leading cause of death among people with diabetes. Hypertension affects an estimated 60–80% of people with Type 2 diabetes, and improved vascular function directly supports better glucose delivery to tissues and more efficient metabolic function throughout the body.

AMPK Activation and Metabolic Regulation

Repeated heat exposure has been shown to upregulate AMP-activated protein kinase (AMPK), an enzyme often described as the body's "master metabolic switch." AMPK plays a central role in modulating circulating glucose by improving insulin sensitivity and optimizing lipid levels. It has also been proposed as a master regulator of lipid synthesis, which is particularly relevant given that dyslipidemia — abnormal cholesterol and triglyceride levels — is a strong predictor of cardiometabolic disease in people with diabetes.

What the Clinical Research Shows

The theoretical mechanisms above are supported by a growing — if still developing — body of clinical research. Here's what the studies have found so far.

Far-Infrared Sauna Use and Quality of Life in Type 2 Diabetes

A study published in the Journal of Alternative and Complementary Medicine by researchers at the University of British Columbia examined patients with Type 2 diabetes who used a far-infrared sauna three times per week for 20-minute sessions over a three-month period. The study found significant improvements in physical health, general health, and social functioning scores, along with meaningful reductions in self-reported stress and fatigue. The researchers concluded that far-infrared sauna use may be associated with improved quality of life in people with Type 2 diabetes — and notably observed that patient uptake of sauna therapy was higher than uptake of other recommended lifestyle interventions.

That last finding is worth emphasizing. One of the biggest challenges in diabetes management is adherence to lifestyle changes. If patients are more willing to use a sauna consistently than to maintain an exercise program, and if the benefits overlap meaningfully, sauna therapy becomes a practical tool — not just a theoretical one.

Repeated Heat Therapy and Insulin Sensitivity

A study published in the American Journal of Physiology: Endocrinology and Metabolism investigated whether repeated hot water immersion (a form of passive heat therapy mechanistically similar to sauna use) could improve insulin sensitivity in individuals with Type 2 diabetes. After 8–10 days of sessions designed to raise deep body temperature, researchers found improvements in fasting insulin sensitivity and reductions in fasting plasma insulin concentrations. The researchers noted that if the intervention were conducted over a longer period, reductions in both fasting and postprandial glucose might also become evident.

Insulin Absorption in Type 1 Diabetes

For people with Type 1 diabetes, the research points to a different but equally important mechanism. A study published in the British Medical Journal examined eight insulin-dependent diabetic patients and found that sauna exposure (two 25-minute sessions at 85°C) accelerated insulin absorption from subcutaneous injection sites by 110% compared to room temperature. Blood glucose concentrations dropped by 3.0–3.3 mmol/L following the sauna session, and the decrease was proportional to the increased rate of insulin absorption.

This finding has practical implications: people with Type 1 diabetes who use saunas may need to adjust their insulin dose or timing to prevent hypoglycemia. It's a benefit and a risk — faster absorption means more efficient insulin use, but it also means blood sugar can drop unexpectedly if dosing isn't adjusted.

Hot Tub Therapy and Fasting Glucose

An early but frequently cited study published in the New England Journal of Medicine by Dr. Philip Hooper examined eight patients with Type 2 diabetes who sat in a hot tub (water temperature 37.8–41.0°C) for 30 minutes per day, six days per week, for three weeks. Mean fasting plasma glucose decreased from 182 mg/dL to 159 mg/dL, and mean HbA1c levels decreased from 11.3% to 10.3%. While hot tub immersion isn't identical to sauna bathing, it operates on the same passive heat therapy principles, and researchers frequently cite this study as supporting evidence for thermal therapy's effect on glycemic control.

Cardiovascular Benefits Relevant to Diabetes

The landmark Finnish Kuopio Ischemic Heart Disease Risk Factor (KIHD) study — one of the largest and longest studies ever conducted on sauna use — followed over 2,300 men for more than 20 years and found that those who used a sauna four to seven times per week had significantly lower risks of sudden cardiac death, fatal coronary heart disease, and all-cause mortality compared to those who used a sauna once per week. While this study wasn't specifically focused on diabetes, the researchers adjusted for diabetes status in their analysis, and the cardiovascular benefits are directly relevant to the elevated heart disease risk that people with diabetes face.

The Nuance: Single Sessions Don't Move the Needle

It's important to present the full picture. A 2024 randomized controlled crossover trial published in Experimental and Clinical Endocrinology & Diabetes found that a single infrared sauna session did not improve postprandial blood glucose handling in individuals with Type 2 diabetes. In fact, the study observed a slightly more pronounced postprandial glucose rise after the heated condition compared to a thermoneutral control.

This finding doesn't contradict the broader research — it reinforces the critical point that sauna therapy for diabetes management is about consistent, repeated use over weeks and months, not one-off sessions. The chronic adaptations (HSP upregulation, improved vascular function, reduced inflammation, enhanced insulin signaling) require time to develop, just as the cardiovascular benefits of exercise require a sustained training program rather than a single workout.

Traditional Finnish Sauna vs. Infrared Sauna for Diabetes Management

Both traditional saunas and infrared saunas have demonstrated benefits relevant to diabetes management, but they work differently — and those differences may matter for people whose diabetes has caused complications like neuropathy or cardiovascular instability.

Traditional Finnish saunas heat the air to 80–100°C (176–212°F) with relatively low humidity. They produce the most robust cardiovascular stimulus — heart rate elevates significantly, and the body's thermoregulatory response is more intense. The majority of the long-term epidemiological data (including the KIHD study) comes from traditional Finnish sauna use. If your diabetes is well-controlled and you don't have significant neuropathy or cardiovascular complications, a traditional sauna offers the strongest evidence base.

Infrared saunas operate at lower air temperatures — typically 48–60°C (118–140°F) — but use infrared wavelengths that penetrate directly into tissue, raising core body temperature without the extreme ambient heat. For people with diabetes who have heat sensitivity, neuropathy, or cardiovascular concerns, infrared saunas offer a more comfortable and potentially safer entry point. The UBC quality-of-life study mentioned above used far-infrared saunas specifically, and several researchers have noted that infrared therapy may be particularly well-suited for patients who cannot tolerate the intense heat of traditional saunas.

Far infrared saunas are the most studied infrared type in the context of diabetes and cardiovascular health. Full spectrum infrared saunas add near and mid infrared wavelengths, which provide additional benefits for circulation and tissue healing — potentially relevant for the wound-healing and microvascular challenges that diabetes can create. Hybrid saunas that combine infrared panels with a traditional electric heater give you the flexibility to choose your session type based on how you're feeling on a given day.

Building a Safe Sauna Routine With Diabetes

If you have diabetes and want to incorporate sauna therapy into your wellness routine, the following guidelines will help you do so safely and effectively. These are informed by the clinical literature and the safety recommendations that researchers have consistently emphasized.

Before You Start

Talk to your endocrinologist or primary care physician before beginning regular sauna use. This is especially important if you have diabetic neuropathy (nerve damage that may impair your ability to sense heat), cardiovascular complications, retinopathy, nephropathy, or poorly controlled blood sugar. Have your doctor assess your current A1C levels, review your medications, and discuss whether any of your drugs may interact with heat exposure (some diabetes medications can affect thermoregulation or hydration). If you use insulin, discuss timing and dosage adjustments — heat accelerates insulin absorption, and your usual dose may produce a stronger effect during or after a sauna session.

Session Protocol for Diabetes Management

Based on the protocols used in the clinical studies that have shown benefits, a reasonable starting framework looks like this:

Frequency: Three to four sessions per week. The UBC far-infrared study used three sessions per week. The broader cardiovascular research suggests that benefits increase in a dose-response manner up to four to seven sessions weekly, but starting at three per week is prudent.

Duration: 15–20 minutes per session. Avoid the temptation to push longer sessions early on. The studies that demonstrated benefits used moderate session lengths — not marathon sauna sits.

Temperature: For infrared saunas, 48–60°C (118–140°F). For traditional saunas, 75–85°C (167–185°F) is a reasonable range — you don't need to push extreme temperatures to get the metabolic benefits.

Progression: If you're new to sauna bathing, start with 10-minute sessions at a moderate temperature and increase gradually over two to three weeks. Monitor how your body responds before adding time or heat.

Blood Sugar Monitoring

Check your blood glucose before entering the sauna. If it's below 100 mg/dL, eat a small snack first. If it's above 250 mg/dL, hold off — high blood sugar increases dehydration risk and can impair your body's thermoregulatory response. If you use a continuous glucose monitor (CGM), keep it accessible. Note that extreme heat may affect the adhesive on CGM sensors, though the sensors themselves are generally rated for body-temperature heat exposure. Check again after your session and have a fast-acting carbohydrate source available in case of a low.

Insulin Management

If you take injectable insulin, be aware that sauna heat can accelerate absorption from the injection site by more than 100%. Consider reducing your pre-sauna insulin dose (with your doctor's guidance), choosing an injection site that won't be directly exposed to the sauna's heat source, and timing your session so that it doesn't coincide with peak insulin activity. If you wear an insulin pump, consult your pump manufacturer's heat tolerance guidelines. Some pumps may need to be removed during sauna sessions.

Hydration

Dehydration is a real risk during sauna sessions, and it's more dangerous for people with diabetes because elevated blood glucose already promotes fluid loss. Drink at least 16 ounces of water in the hour before your session, sip water during the session if possible, and drink another 16–24 ounces afterward. Avoid alcohol before or during sauna use — it compounds dehydration and can mask symptoms of hypoglycemia.

Neuropathy Considerations

Diabetic peripheral neuropathy can reduce your ability to sense heat, increasing the risk of burns. If you have neuropathy in your feet or hands, use a thermometer to verify the sauna temperature rather than relying on how the heat feels, sit on a towel and keep your feet on a towel rather than directly on hot wood, check your skin (especially your feet) after each session for redness, blistering, or irritation, and consider using an infrared sauna, where lower air temperatures reduce the risk of surface burns while still delivering therapeutic heat.

When to Skip a Session

Don't use the sauna if your blood sugar is very low or very high and difficult to correct, you feel dizzy, nauseated, or unwell, you have an open wound or active infection (diabetes slows wound healing and increases infection risk), you've recently consumed alcohol, or your doctor has advised against heat exposure for any reason.

Sauna Therapy as Part of a Comprehensive Diabetes Management Plan

No responsible discussion of saunas and diabetes should suggest that heat therapy replaces the foundational pillars of diabetes management: diet, exercise, medication adherence, and regular medical monitoring. The research is clear that sauna therapy works best as a complement to these strategies — not a substitute.

That said, sauna therapy occupies a unique niche. It offers physiological benefits that overlap with exercise — improved cardiovascular function, enhanced insulin sensitivity, reduced inflammation, lower blood pressure — while being accessible to people who may not be able to exercise due to pain, neuropathy, mobility limitations, or other diabetes-related complications. The UBC researchers specifically noted that patient uptake of sauna therapy exceeded uptake of other lifestyle interventions, suggesting that ease of use and enjoyment play a role in real-world adherence.

Researchers have also found that combining sauna use with exercise produces greater benefits than either intervention alone. An RCT published in Mayo Clinic Proceedings found that eight weeks of regular sauna sessions combined with exercise produced substantially greater reductions in systolic blood pressure and improvements in cardiorespiratory fitness compared to exercise alone. For people with diabetes who are able to exercise, using the sauna after a workout may amplify the metabolic and cardiovascular benefits of both activities.

Some research also highlights the stress-reduction benefits of sauna bathing, which are indirectly but meaningfully connected to diabetes management. Chronic stress elevates cortisol, which in turn raises blood glucose levels, promotes visceral fat storage, and worsens insulin resistance. Regular sauna sessions lower cortisol levels, improve sleep quality, and activate the parasympathetic nervous system — all of which support more stable blood sugar control over time.

Choosing the Right Sauna for Diabetes-Focused Wellness

If you're considering adding a sauna to your home specifically to support diabetes management, here's how to think about the decision.

For people who are new to sauna therapy or who have neuropathy, heat sensitivity, or cardiovascular concerns, a residential infrared sauna is the most forgiving starting point. Lower air temperatures, gentle radiant heat, and quick warm-up times make sessions comfortable and easy to integrate into a daily routine. Far infrared models are the most researched for metabolic and cardiovascular benefits, while full spectrum models add near and mid infrared wavelengths that offer additional support for circulation, tissue repair, and skin health.

For people with well-controlled diabetes who want the strongest cardiovascular stimulus and the deepest body of supporting research, a traditional Finnish sauna provides the most intense heat exposure and the most direct connection to the long-term epidemiological evidence.

For maximum flexibility, a hybrid sauna lets you alternate between infrared and traditional sessions — useful if your energy, blood sugar levels, or symptoms vary from day to day. On days when you feel strong and your numbers are stable, you can run a traditional session. On lower-energy days, switch to a gentle infrared session that still delivers therapeutic benefits without the intensity.

Haven of Heat carries traditional, infrared, full spectrum, and hybrid saunas from brands like Finnmark Designs, Dynamic Saunas, Golden Designs, and more — with free shipping, flexible financing, and models that qualify for HSA/FSA reimbursement. If you're not sure which type is right for your situation, our Sauna Selector Tool can help narrow the field based on your space, budget, and wellness goals.

Frequently Asked Questions

Is it safe to use a sauna if I have diabetes?

For most people with well-controlled diabetes, sauna use is considered safe. The key qualifications are that your blood sugar is reasonably stable, you don't have severe unmanaged neuropathy that prevents you from sensing heat, and your healthcare provider has cleared you for heat exposure. Research across multiple studies has reported good safety profiles with no significant adverse events when appropriate precautions are followed.

Can saunas lower blood sugar?

Repeated sauna use over weeks and months has been associated with improved insulin sensitivity and, in some studies, reduced fasting glucose levels. However, a single session is unlikely to produce a meaningful acute reduction in blood sugar — and for people taking insulin, the accelerated absorption caused by heat can actually cause blood sugar to drop too fast if dosing isn't adjusted. The benefits are chronic and cumulative, not instant.

How often should I use a sauna for diabetes management?

The studies showing benefits used protocols of three to seven sessions per week. Three sessions per week for 15–20 minutes each is a well-supported starting point based on the clinical research. You can read more about optimal sauna frequency in our guide on how often you should sauna.

Is infrared or traditional sauna better for diabetes?

Both types have demonstrated benefits. Infrared saunas operate at lower temperatures, which may be more comfortable and safer for people with neuropathy or heat sensitivity. Far infrared saunas have the most direct research in diabetes-specific studies (including the UBC quality-of-life trial). Traditional Finnish saunas have the largest body of long-term epidemiological evidence for cardiovascular benefits. The best choice depends on your individual health profile and comfort level.

Will sauna use interfere with my diabetes medication?

Heat can affect how your body absorbs and responds to certain medications, including insulin. Some oral diabetes medications may also interact with the dehydration and cardiovascular changes that occur during heat exposure. Always discuss your specific medications with your doctor before starting regular sauna use.

Can sauna therapy help prevent diabetes?

There is emerging evidence that regular heat therapy may improve insulin sensitivity and reduce metabolic risk factors in people who are prediabetic or at elevated risk for Type 2 diabetes. The mechanisms — HSP activation, improved vascular function, reduced inflammation, AMPK upregulation — are all relevant to diabetes prevention. However, sauna therapy should be viewed as one component of a broader prevention strategy that includes diet, exercise, weight management, and regular medical monitoring.

Should I use a sauna before or after exercise?

Research suggests that using a sauna after exercise may produce greater cardiovascular and metabolic benefits than either intervention alone. Post-workout sauna use extends the period of elevated heart rate and vasodilation, amplifying the training stimulus. For people with diabetes who exercise regularly, finishing with a 15–20 minute sauna session is a well-supported protocol. Learn more about how saunas support overall wellness in our sauna health benefits guide.

The Bottom Line

The research on sauna therapy and diabetes management is encouraging and continues to grow. Regular sauna use — particularly far-infrared and traditional Finnish sauna bathing at a frequency of three or more sessions per week — has been associated with improved insulin sensitivity, better cardiovascular function, reduced inflammation, lower blood pressure, and meaningful improvements in quality of life for people living with Type 2 diabetes. For people with Type 1 diabetes, the accelerated insulin absorption effect is both a potential benefit and a reason for careful monitoring and dose adjustment.

Sauna therapy is not a cure for diabetes. It doesn't replace medication, diet, exercise, or regular medical care. But as a complementary tool — one that's accessible, enjoyable, and backed by a growing evidence base — it's a strategy worth discussing with your healthcare team. For people who struggle with exercise due to diabetes-related complications, it may offer overlapping physiological benefits through a more accessible modality.

If you're ready to explore sauna options for your home, browse Haven of Heat's complete selection of infrared saunas, traditional saunas, and hybrid saunas — all backed by free shipping, financing options, and expert support to help you find the right fit for your wellness goals.

*Haven Of Heat and its affiliates do not provide medical, legal, electrical, building, financial, or professional advice. All content published on this website is for general informational and educational purposes only and should not be relied upon as a substitute for advice from qualified professionals. Always consult a licensed medical provider regarding health-related questions.