I think it's not so much a matter of the specific foods that people are repulsed by or are convinced will give them hideous diseases and death, but more a matter of "obsession", period. Or "addiction", period.
When a person puts all their focus on one thing and has their life revolving around that one thing like a form of worship, it pretty much consumes them from what I've seen.
I'm getting tired of food-obsessed people throwing out all social graces and courtesy when it comes to dining (not just "eating") with other people.
It is rude, and used to be socially unacceptable, to be a guest at somebody's wedding reception, class reunion people have spent years planning, retirement party, or at somebody's VACATION cruise-ship dinner table, and start haranguing about "what's wrong and unhealthy and thus disgusting" about the perfectly good, expensive food that is being served.
Dinner guests are not there to analyze, critique and harangue about the origin, cultivation, harvesting, packaging, shipping, storage, cooking and serving quality of the food. They are there to share a meal in the company of the other people who have gathered to celebrate and enjoy an occasion or event or vacation, not to tell the host how ignorant and careless they are about the food they've bought, prepared and served.
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