hey there, you can have very different diets and end up with the same dietary problems. if you yourself don't get enough dietary zinc in the first place, and meanwhile your meat eating friend eats lower zinc meat options and too much bread and/or high phytate foods, voila - poor zinc status in both.
d3 levels and ambient uvb is correlated with ms in australia, here's just one study: http://content.karger.com/produktedb/pr ... 83&typ=pdf
also, when you move from a low risk area of the globe to a high risk area, one's chances of ending up with ms still increase.
re your workplace - that is certainly a lot of disease in a small population, no fun.
which supplements have you tried for sleep so far? don't answer if you don't want to, but i do know certain nutrients which tend to be low in ms patients, also athletes, and potentially those on certain diets, which could result in fatigue and insomnia (eg magnesium for starters). something you may wish to consider testing and/or diet mods and/or supplementing.
i can't find a study looking at zinc status in meniere's but zinc levels are linked in research to the tinnitus seen often in meniere's patients. your hubby might benefit from a serum zinc test (you might also benefit too) and possibly diet mods w/ supplements. is he also vegetarian by the way?
Am J Otol. 1989 Mar;10(2):156-60.
Zinc: the neglected nutrient.
Shambaugh GE Jr.
"Zinc was first recognized as essential for animals at the University of Illinois School of Agriculture in 1916, when it was found that zinc-deficient baby pigs were runty, developed dermatitis on their legs, and were sterile. Zinc deficiency was first recognized in man by Dr. Ananda Prasad of Detroit 26 years ago when he measured serum and hair zinc levels in young male Egyptian dwarfs who had failed to mature and were small in stature. By simply adding zinc to their regular diet, they grew in height and became sexually mature. It is now recognized that dwarfism in males is frequent around the Mediterranean, where wheat is the staple of life and has been grown for 4,000 years on the same soil, thereby resulting in the depletion of zinc. Professor Robert Henkin first suggested that zinc deficiency might cause hearing-nerve impairment. Assay of the soft tissues of the cochlea and vestibule revealed a zinc level higher than that of any other part of the body. Previously, the eye was considered to have the highest level of zinc of any organ. To diagnose zinc deficiency clinically, we use serum zinc assays made at the Mayo Clinic Trace Element Laboratory. With zinc supplementation in patients who are marginally zinc deficient, there has been improvement in tinnitus and sensorineural hearing loss in about one-third of elderly adults. We believe zinc deficiency is one causation of presbycusis; by recognizing and correcting it, a progressive hearing loss can be arrested."