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Hi Emathis sounds like rubbish to me. Once water enters the body it doesn't stay cold for long. The liquid runs down the oesophagus, behind the heart, picking up heat all the while. By the time it reaches the stomach it's close to body temperature, 37 degrees celsius.All of the body's components are optimised to work at this temperature, including the processes that absorb nutrients and minerals. I'd suggest to your gym instructor that he sticks to advising people about exercise and fitness and leaves gatroenterology to the people who know what they're talking about!Chris