Help me Understand Popcorn

Lots of people recommend air popped popcorn as an easy, and healthier way to enjoy snack foods. So I bought an air popper. But I found the calorie content of popcorn kernels quite shocking when compared to the bags of microwave popcorn. Here’s what I read at my local grocery store: bag of popcorn kernels (50g) has 190 calories and 2.5g of fat. A microwave bag of popcorn (said “butter popcorn” but it’s the “healthier” less buttery flavour) (50g) has 170 calories and 3G of fat. The buttery microwave popcorn (50g) has 220 calories and 10g of fat. So air popping kernels is definitely cheaper, it seems to me that it’s not any healthier than microwaving a non- super buttered bag of popcorn.

I’d really welcome anyone’s insight as snacking is my kryptonite.