When I was a kid we had a CO whose wife apparently had a phobia of aluminum foil. When they sent word ahead of time of their visits, the elders were made to go around and make a big point of telling everyone who had the privilege of feeding them that no aluminum foil could be used in any way so that it touched the food.
I understand that people read articles that scare them about certain products but it seemed unnecessarily pompous and rude to make demands like that on people who are feeding you for free. You wouldn't go into a restaurant and demand to know what methods they use to cook and cover their food (or maybe they did?)