Fitness Myth - Sitting in a Sauna Helps to Lose Weight
Sitting in a sauna can be a great form of relaxation. I have used a sauna after a good run and have always noticed people who sit in them for long periods of time wearing those full body thermal or vinyl suits. They are dripping in sweat and I think it is safe to assume they thought they were doing their bodies a huge favor by sweating out toxins and helping in weight loss. However, this simply isn’t the case. The most you are doing to your body is dehydrating it.
Any water weight that you may have lost while sitting for long periods of time in a sauna is replaced once you begin drinking fluids again. So be cautious when spending too much time in a sauna. You don’t want to become dangerously dehydrated.
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totally agree with the not dehydrating part but the physical act of producing a drop of sweat does have a calorific cost to the body. so providing you just rehydrate with water - you will have burnt off some calories.