I take my dad 85% chocolate he also likes a bit of Stilton and a strong cheese, I don't take nuts as there is a couple of ladies with nut allergies that have dementia and can wander a bit and help themselves bless em, the Home prefers us not to take nuts for this reason although that's no problem for us as dad has swallowing issues anyway
Dads place is fantastic, he gets lots of suitable treats and snacks and he doesn't really need treats but it is nice to take something
I also take a small pot of strawberries and cream, little cans of Diet Coke, you could make him a low carb cake, one thing my dad loves is olives and feta cheese,