Firestormm - as the maternal haplogroup is based on mitochondria (mtdna) inherited from our mothers, maybe a poll would be informative in that the haplogroups differ in mututations. And maybe mito mutations can affect energy production.
ukxmrv- is that it, or is that something else?
I've wondered whether children of women with me/cfs are more likely to also be affected than children of men with me/cfs, as the former would share the mtdna and the latter would not. Never heard that anyone has looked into it.