Well don't forget, there are also a lot of "fatties" that gained all their weight due to health issues like lymphoma or Cushing’s Syndrome or even something as simple as knee pains that prevent exercise. (Which I am fighting off at the moment and it hurts like hell)
My cousin got lymphoma and she used to be so beautiful, healthy and slender, until she as diagnosed and over time got really fat because of it and the drugs she as put on.
Even I will agree, living in Maine, USA, my entire life, I am slightly disgusted in my on country as well, but no country is perfect. We just have to deal with the fact not everyone cares about what they look like or how they act.
Most are due to overeating gluttons, but there are still the percentage of people overweight due to medical issues. (My mother is a nurse and I study her books and papers when I get bored.... Don't judge me lol)