But extreme fussiness of the type mentioned by the OP is hugely restrictive and not a balanced diet.
Again, that doesn't make your partner a child who needs parented. They are an adult who, with all the relevant information, still gets to decide to eat mars bars all day if they like.
If you want to live a "normal" life going out for dinner, popping round for a barbecue at friends houses, going on holiday, it makes life a lot easier if you will eat a wide range of foods.
Yes, who would have thought it! Talk about stating the obvious.
How can you expect children to grow up with a healthy attitidue to food and eating when their parent recoils in horror at the idea of a lettuce leaf or mashed potato instead of chips.
One of their parents. They have two. They also have tastes of their own.
The issue is that some fussy eaters get hugely defensive
I can't imagine why when you look at some of the things they get called (you don't need to look further than this thread)
demand that everyone panders to their fussiness
I can't see that OPs DH has done that.
and won't acknowledge that they have a problem that they need help with.
Well when we they have spent their entire life being labelled as fussy and called a toddler, a spoiled baby, immature. Perhaps they don't actually realise they do have an issue that can be helped, perhaps they have taken on all those things people have called them throughout their lives and maybe it will take some time and being left to their own food devices to work out what their actual problems are and decide if they want to get help. Or perhaps they actually have tried to get help or are getting help or are on the waiting list to get help but haven't had time to take out the ad in the paper to let everyone who thinks it's their business know.