03 Feb 2014 The sauna is a magnet for overweight people who want to lose weight. While sweating out buckets of water causes a temporary drop in weight, saunas do nothing for your long term weight prospects. A sauna, or any hot environment, forces the body to sweat for temperature control. You're not sweating out any of your excess body fat because that weight loss solution would be too simple. When has the simple way, with little or no work required, ever produced long term, quality results? (Hint: never).