A few years back, I saw Dr. Wahls' Tedx talk, "Minding Your Mitochondria".
Dr. Wahls had multiple sclerosis and became disabled to the degree that she was confined to a zero-gravity wheelchair when the tilt-recline became insufficient.
She did a bunch of research about what was necessary to fuel the mitochondria, the powerhouse of the cells. First, she went paleo, but that wasn't sufficient. Next, she added a whole bunch of various vegetables to her diet and she got well. Her Tedx talk ends with her on a bicycle!
If you haven't seen it, the YouTube shows below; I highly recommend you take a few minutes to see it if you haven't.