I am diabetic, but can splurge on occasion depending on my health. If someone gives me tempting sweets when I am having to be good, it can make me cry. if someone gives me diabetic food, it feels like they are nagging me. You can’t win.
Even a ham or a cheese basket is problematic if they have heart problems.
A nice fruit basket is the only thing that might work if they are not older.
A heartfelt letter is probably the best option. If the rift has lasted that long, ANY gift could be wrong ("Apples? They think they can fix this with apples???")