You ask why do I think this?
I suspected for some time that my bowel health had something to do with my diagnosis. I had several incidents over the years that were bowel related.
I always suffered from bloating and at times had excruciatingly paindful cramps (IBS) I was on anti inflamatory drugs for a while for a sporting injury
When I gave up wheat the bloating stopped and the tingling in my legs stopped also and returned if I had wheat again.
The Kinesiologist I saw about my condition told me I was gluten intolerant and when I researched this further everything really started to drop into place. He also said I had bad Candida and when I addressed this my whole health outlook changed.
I am now symptom free (MS) and have a much better general health and my digestion is massively improved. Also, my skin rashes have disappeared.
The evidence to me is clear in the way I am now.
See my profile and website for more detail if you want the full story.