I was talking with my mother-in-law yesterday and we started talking about diet soda (I won't touch the stuff). She mentioned how my husband's ex-wife, who is a nurse, told her about how all the doctors and surgeons said they could tell which patients drank diet soda. They could tell just by touching their skin. One day when in surgery, the doctors were saying, yep, this one patient was one who drank diet soda. So my husband's ex-wife decided to check it out. Sure enough, that patient confirmed they were a diet soda drinker. And she checked with several other patient, too. Diet soda drinkers have skin that feels very leathery, not like healthy skin.