It's interesting. In my jw side of the family there are both. Some are all organic, no gluten, no dies, no chemicals, no vaccines, no medications, and no doctors (some of them no dr. even during childbirth). They don't avoid these items due to allergies. It's more of a distrust of worldly drs and food companies. Others from the same family love junk food. Lots of soda, sugar, white flour, booze, and lots of meds from doctors. I think for them they truly believe the big A will be here before they die so why not have 6 doughnuts for breakfast?
All that being said, I don't think it's unusual to find this in non jw families as well.