There were two things that made me realize how difficult losing weight must be for most people. The first is that if you lose weight and get reasonably fit, you’re far less likely to die and you just feel better. It’s an enormous improvement in one’s life.
The other is that if you are not overweight or obese, you are automatically ahead of about 70% of people in the dating market.
That people do not do these things means that losing weight and getting a bit fit must be much, much harder than I experience. Otherwise, everyone would do it given the enormous and obvious benefits.