I have friends who own a rest home and they strive hard to offer balanced meals and even tried gourmet food at one time, wanting what they saw as the best for their elderly residents.
It wasn't too expensive as most of them had small appetites ( the pictured meal is twice the size of their servings) however, the diners poked and prodded and left most of the salads, hated anything unusual such as goat or feta cheese, "MUCH too salty!"
They were always served an entree and dessert but these too were shot down. "I never took to that yoghurt stuff"
'What's this?
'Lychee.'
'Looks like a drowned sailor's eyeball, take it away it's makin' me feel sick.'
So they asked the residents what, ideally, they wanted to eat.
"None of that foreign muck for starters." Which eliminated a great deal of what had been planned but of course bananas aren't foreign so they got away with that!
And eventually, in true Kiwi style, they requested mince, mashed potatoes, carrots, ("cabbage gives me wind") fish and chips, steamed or rice pudding ("not that brown rice either, it looks dirty") and all the old favourite roast meals, pies and cakes they grew up with. And why not?
The sugar and fat content is still rigorously watched, they have a nutritionist on staff but when you are in the last decade of your life, surely you're allowed to eat what you really want?
It's also not that easy cooking for 20-30+ people and sticking to the budget the bosses have allotted.
My friends also run a large garden from which they get most of the vegetables but the profit-driven commercial rest homes pare down severely and still charge huge amounts.