This is an interesting topic. I have noticed that bikram definitely makes me retain water, usually about 4-7 pounds. Whenever I take a week or two off I instantly shed the weight. This is frustrating as I eat really well, stay super hydrated and have developed a strong practice over three years. I have recently dropped my practice down to 2-3 times per week and I am noticeably less bloated. I really seem to swell in my face and at that point vanity wins. My studio offers bikram class at 75 degrees so I will try and do that to keep up my strength. I have heard MANY people have the same problem. It’s frustrating as this practice is so cleansing, I always feels like thoroughly cleansed inside and out, full of energy etc. If anyone has any suggestions I would welcome them, I have tried several electrolyte brands as well as himalayan sea salt, also if anyone has a suggestion as to why my husband cramps at night after practicing that would be wonderful, too.