COs were always the worst , with their long list of dietary restrictions / whatever fad diet they were on at the time.
We had a CO and his wife who came when the "not combining food" diet was all the rage in the 1980's - the list was epic - it was no meat with vegetables , must have fruit as a starter , coffee had to be decaff etc etc. We had them staying with us for the week and my poor mother was almost driven demented by the end of the week at having to manage their faddy diet.
I do think JWs are probably more susceptible than "worldly" ones to dietary fads , quackery etc due to their distrust of modern medicine , gullibility to being caught up with MLM / pyramid health schemes ( of which the Society is an obvious religious example ) and the general malaise / depression that comes with being a JW.