Dec 1st 2010 4:27PM Sigrid,
Indeed water weight is regained with rehydration, the calories however are expended by the thermogenic process inherent to infrared sauna treatment and they are lost if not re-consumed. If you would like to read the white papers (2007) by Dr. Serge Morton (Research Director for the French Public Health Ministry) or the technical Japanese studies of FIR (far infrared) therapy and the sweat evaluations, I would be happy to provide them. Then perhaps you will feel better informed.
Toxins not real? I respectfully disagree, as I think many informed readers and health advocates would as well. Ben Goldacre is primarily an epidemiologist with a concentration on the MMR vaccine and autism. The toxins that are referenced in FIR treatment are those that are more environmental and consumer lifestyle in derivation. These are very different by any argument.
Infrared sauna treatment continues to impress its ever growing population of enthusiasts and I hope your holidays will include such an experience to holistically change your mind.