I read an article over two years ago now about how a bunch of people who had been diagnosed with MS based on symptoms and had been avid diet soda drinkers found their symptoms completely resolved when they quit drinking diet soda. I'll look to see if I can find the article again and post it if I do. I remember it b/c my BF at the time was a chain diet coke drinker and was having MS-like symptoms so I took note and asked him to cut out the diet coke and see what happens. I don't think he ever tried it though.