Ask About Food Restrictions
Chemotherapy in particular has wacky effects on people's taste buds. Things that my mother used to love-bread, chocolate, fruit-now taste foul to her. For months she found tomatoes to be too acidic, but loved oranges and grapefruits. People on dialysis need to limit their potassium. Diabetics will want low-cal offerings. There are also food allergies to contend with, and vegetarians/vegans to be accommodated. Ask before you buy and prepare anything. If you're feeling really nice, instead of asking what the person in question can't eat, ask what he would like to eat.