I’m sure if you told someone starving in the Sudan that Americans throw away their extra food for portion control and pay someone to help them run on a treadmill so they can get skinnier they would probably think that was weird too.
Diet pills, diet soda (no nutritional value, it’s designed to “trick” you into thinking you are getting food when you aren’t), bottled water when we have tap water for free… they’re all the same type of thing.