There are so many things in the diet it could be. Or a combination of many of them. For example it could be intestinal permeability combined with milk consumption. People in the west evolved to be able to drink cow's milk after we got into the habit of drinking it. The gene for being able to tolerate lactose should switch off after childhood but now it's continued into adulthood. I read an article about humans are still evolving and this was one example. I've always had a low level intolerance to milk which got worse in my 40's which is when I got MS. The theory of molecular mimicry for MS postulates that leaky gut syndrome allows lactose into the blood where the immune system learns to see it as a foreign body. And permeability in the blood brain barrier allows it to get through to the brain. So I also suffered from Glandular Fever (Mononucleosis, Epstein Barr virus) over 20 years ago which has also been linked to MS and this could have damaged the blood brain barrier.
I have also wondered about processed oils. They get processed way beyond what they would naturally be eating and appear in almost all the food you buy in the supermarkets. Manufacturers don't care. There is little demand for food without these oils and they allow for greater profits as food can last on the shelf longer. I have often spoken to people who don't have MS but other undiagnosed conditions that they treat by eating healthily. That means whole food and decent unprocessed oil.
I have also wondered about processed oils. They get processed way beyond what they would naturally be eating and appear in almost all the food you buy in the supermarkets. Manufacturers don't care. There is little demand for food without these oils and they allow for greater profits as food can last on the shelf longer. I have often spoken to people who don't have MS but other undiagnosed conditions that they treat by eating healthily. That means whole food and decent unprocessed oil.