This is a powerful 18-minute TED talk by Terry Wahls, MD.  She had progressive multiple sclerosis for six years and then changed her diet.  Within 9 to 12 months, she had recovered much of her ability to function normally  Also, a good review of vitamins for my Nutrition class students.  http://www.youtube.com/watch?v=KLjgBLwH3Wc&feature=share