Hi Wally,
It's not just diet that can be a relevant-to-NSD and contentious-to-everything issue here Wally - try looking at exercise compliance - it doesn't always happen. Ditto smoking, which tons of research has shown to exacerbate chronic pain.
(Health) Locus of Control is a huge factor, and probably the only one that would *neatly* result in two distinct groups. (Helpful Hint: don't even go there - not unless you want your AS flamed big style

)
Compliance to the NSD would be a big issue in researching it, and something that difficult to factor in. Whilst I'd be happy for them to feed me through a nasogastric tube

maybe even parenterally, sod it, bung a catheter in as well


whatever it takes to get some credibility into the results....but at the end of the day the sad thing/fact of the matter is that even if research showed 100% unequivocal results for the diet and it was promoted Atkins-style with NSD products/shops a-plenty and with Tampax-style advertising of the fact, there would not be 100% uptake of it.
Well, I'm getting a bit distracted now by imagery of an NSD advert - thoughts of Bilko rollerblading in white pants, or would it be abseiling?? Sorry Bill - but at least I didn't say hotpants
)Take care,
Jan
The first and best victory is to conquer self
— Plato
