FDM..whoever told you that is wrong, hon...it has to do with your body holding toxins in between the fat cells and due to sluggish circulation system. No amount of hot water is going to cause or cure that...

Now, that being said..hot water is horrible for your skin and your hair. Skin, it can cause broken capillaries and dry it out because it helps strip the protective layer of oil that your skin needs (same reason you should NEVER wash with bar soap!!!). Hair should be washed with tepid water and rinsed with cold (ok so that's a bit of a challenge here) because it helps close the cuticle on the shaft of the hair.