With the Soceoeconomic bias in MS,
There may also be additional factors at play in addition to the stress,
* Sanitation may play a role in early childhood exposure to a greater range of antigens hence a more robust immune system, there seems to be a risk cut off rate at the around 15 yo, one assumes the risk rate where puberty was reached, this fits with the role of the Thymus in immune developement as it is very active and large in childhood and atrophies through puberty. So if one gets a new infection after that age there is a much more severe response as it takes much longer to gear up new antibody blueprints which come from the thymus. One for the supporting factors in the molecular mimicry theory is the rates of MS are much higher in low Hepatitis B regions, which suggests late exposure may be a risk factor for MS.
* Breast feeding may also play into that in the multigenerational level where mothers with higher education levels are more likely to have careers and hence more likely to fall back to formula feeding in early childhood and it is known that this is a risk factor in Type 1 DM, SIDS, and a number of other conditions and this also ties in with the A1 Caesin risk in Milk, which is the primary Dairy variant in European (& US) type cattle whereas the African, Asian cattle are A2 Caesin along with Sheep, Goats and ofcourse Human Milk all being the A2 variant.
* UVB exposure may also be related as there is a similar corrolation with skin cancer rates, where indoor workers and higher socioeconomic classes are at greater risk which has been steadily rising and outdoor workers rates have remained fairly steady, hypothesis is glass, which blocks UVB, but not UVA, UVB is required to produce vitamin D which destroys cancer cells, so basically the higher your status, the more glass you have in your house/office and the more exposure you have to damaging UVA and no UVB/D3 for protection. We need a balanced exposure to direct sunlight during the middle of the day from 10-2 ideally, just when authorities tell you to stay out of the sun, also most sunscreens only blocked UVB, because it is what causes sunburn, but this is just the sign to get out of the sun because you have maxed out on Vitamin D production.
Link on the Skin Cancer thing:http://fitnessblackbook.com/main/avoidi ... at-advice/
As you may suspect my feelings are all these and many more factors combine to weaken the body and open the door to chronic disease, and correction of as many as possible is the most probable path to healing.