People are always talking about using saunas for weight loss. But which kind of sauna are they talking about? Is one better than the other?
Neither a steam room nor a sauna is established here as a method for lasting fat loss. A lower scale reading after sweating can reflect fluid loss. The studies discussed below do not establish that one room is better than the other for reducing body fat.
Keep reading to find out more about steam rooms vs saunas for weight loss!
Can steam rooms and saunas help with weight loss?
First off, can steam rooms and saunas even help you lose weight?
Separate three outcomes: an immediate change on the scale, energy used during a session, and lasting loss of body fat. Measuring one does not establish the other two.
There is no reliable, universal calorie allowance supplied by the evidence reviewed here for a 15-minute or one-hour visit. Do not multiply an unsupported per-session estimate into a monthly weight-loss forecast.
The 2014 dry-sauna study found a relationship between BMI and short-term body-mass loss in young adults. The authors discussed dehydration and fluid replacement, not greater fat-loss benefits for people with a higher BMI.
Relaxation, stress, eating habits and body weight are different outcomes. Feeling relaxed after a visit does not demonstrate that the visit caused fat loss.
Dry saunas
Let’s talk about how dry saunas work.
This guide does not prescribe a minimum dry-sauna stay for fat loss or “detox”. Do not keep sitting in heat to reach a weight-loss target. Leave if you feel unwell.
After exercise, do not use a fixed waiting period as proof that another heat exposure is suitable. The CDC’s heat-illness guidance lists headache, nausea, dizziness and weakness among symptoms of heat exhaustion. If these occur, stop heat exposure and seek medical evaluation; confusion or loss of consciousness requires emergency help. This guidance concerns heat illness, not a sauna weight-loss protocol.
This article does not assign a percentage increase in calorie use to dry-sauna bathing or treat a hormonal response as proof of improved recovery. Those claims require evidence for the particular outcome, not just a response to heat.
Infrared saunas
If you’re an infrared sauna fan, listen up!
An infrared session is not assigned a fixed weight-loss dose here. Neither a lower air temperature nor a longer stay establishes a fat-loss benefit.
Do not stay in an infrared sauna for 20 or 30 minutes simply to meet a metabolism or calorie target. Follow the equipment’s instructions and any individual medical advice, and stop earlier if you feel unwell.
Steam rooms
Steam-room comfort and humidity are separate questions from weight management.
This guide does not recommend a minimum steam-room stay for weight loss. Do not extend a session to force a lower scale reading.
A 2014 study of young adults in a dry sauna examined short-term body-mass loss and fluid replacement. It did not establish lasting fat loss or compare a steam room with a dry sauna. Its session schedule is a research protocol, not a personal prescription.
There is no “detox” countdown recommended here. Sweating is not a reason to remain in heat when you feel unwell, and a discussion of substances measured in sweat does not establish a treatment for poisoning.
Is a sauna or steam room better for weight loss?
What would a useful comparison of steam rooms and saunas need to measure?
A comparison would need to measure body-fat change over time, not merely sweat or immediate body-mass change. The cited dry-sauna studies do not establish a steam-room advantage for lasting fat loss.
Claims that moist heat penetrates muscles better do not, by themselves, demonstrate better recovery or more fat loss. No such advantage is recommended on this page.
A short-term metabolic measurement cannot be converted directly into a guaranteed change in body fat. The small study behind the percentage claim is discussed below with its limitations.
Likewise, a rise in heart rate during heat exposure is not a personal calorie counter. Do not use it to set a longer stay or replace a workout.
Water weight vs burning calories
What’s the difference between water weight and burning calories?
A sweat-related change on the scale is not a measurement of fat burned. Energy expenditure and fluid loss must be assessed separately.
A lower scale reading after sweating can largely reflect fluid loss rather than fat loss; see the Cleveland Clinic explanation. Do not use a sauna or steam room to deliberately dehydrate for a sports weigh-in. Weight management for competition should be planned with qualified healthcare and sports-nutrition professionals, not by chasing a last-minute scale change.
Common calorie-burning claims: what they do and do not show
The following are common arguments used to promote sauna weight loss. They need different kinds of evidence.
Check these claims separately rather than treating them as proven fat-loss mechanisms:
- Sweating
- Increased heart and respiratory rate
- Workout recovery
- Increased metabolism
- An incentive to use the gym
Now let’s elaborate on these bullet points.
Sweating
How does sweating help you lose weight?
Sweating can lower body mass through fluid loss; it does not measure a reduction in body fat.
Deliberate dehydration is not recommended here as a way to make weight. A historical CDC investigation of three wrestler deaths in 1997 described rapid weight cutting involving strenuous exercise in heat, fluid restriction and vapor-impermeable clothing. This was not a trial of ordinary sauna use; it is a warning against hazardous weight-cutting practices, not an instruction for using them.
As Cleveland Clinic explains, the amount of sweat is not a reliable calorie-burn measure. Trying to produce more sweat is therefore not a useful way to calculate fat loss.
Increased heart and respiratory rate
What’s the big deal about having an increased heart and respiratory rate?
A higher heart or breathing rate during heat exposure does not establish lasting fat loss.
The previously cited 2019 paper on blood pressure and heart rate during sauna bathing concerns acute cardiovascular responses. Do not read a comparison of cardiac workload as proof that sauna bathing provides the same weight-management or training outcomes as exercise.
Breathing faster or consuming more oxygen is not, on its own, evidence that a particular session reduced body fat.
Workout recovery
How do saunas help with workout recovery?
Recovery and fat loss are separate outcomes. Even evidence about one would not automatically demonstrate the other.
For any post-workout claim, ask what was measured: perceived soreness, performance, a blood marker or body composition. These outcomes are not interchangeable.
The earlier claim that sauna use halves delayed-onset muscle soreness is not retained here: a suitable source for that general promise has not been established in this review.
Nor does this comparison promise better future workouts from a sauna visit. Recovery claims should be matched to the participants, treatment and outcome actually studied.
Waiting ten minutes after exercise is not a guarantee against overheating or dehydration. Do not add sauna time to chase a weight or calorie target, and do not continue heat exposure if you develop symptoms of heat illness.
Increased metabolism
Where did the “33%” metabolism claim come from?
The cited result is from a small, intensive dry-sauna experiment—not a universal boost from one ordinary visit or proof of lasting fat loss.
A 1986 study of ten healthy men reported a 25–33% increase in metabolic rate after the first day of repeated heat exposure. It also reported dehydration-related changes and highlighted electrolyte balance. The study’s intensive protocol is not a recommendation to copy.
That finding does not establish a fixed calorie figure for every user, a “50% more calories” rule, or a steam-room fat-loss benefit. A measured short-term response is not a guaranteed long-term weight outcome.
An incentive to use the gym
Some people just don’t like going to the gym. Can saunas help?
Enjoying a facility may be a personal reason to visit the gym, but it is not evidence that the sauna itself causes fat loss.
If a sauna is part of a routine you enjoy, keep that preference separate from claims about how much weight it will make you lose.
For practical preparation, see what to wear in a sauna. Choose suitable clothing and follow the venue’s rules—not a sweat-maximising or weight-cutting plan.