What size serving is 32 calories? The nonfat sugar free yogurt I get is 227 grams (8oz)....it has 120 calories....maybe you should eat more servings at a time....either that or there is something funky with how you are figuring out the calories?
Sorry...this not making myself eat enough is a problem I have never had...
Quite the contrary....but you've got to eat - especially if you are exercising...your body needs fuel to build muscle.
If you need to add some calories - easy ones are peanut butter....avocados...good fat - you don't have to eat a lot to bulk up your day. Natural peanut butter (just ground peanuts - not Skippy, too many weird things in there) is like 100 cals a tablespoon (15 g).