Its your own personal responsibility, so stop looking tp point the finger of BLAME elsewhere.
One of the things I find difficult is when it gets hot because I love to walk around,I try to remember to take the stairs instead of the elevator,walk shorter distances instead of using transport,dont really do fast food .Little things that help fit in at least a little exercise.
As I think most of us ran around more and were much more physically active as kids obesity was less .