I can't abide this line that it's all about diet. I'm a big guy >270lb. When I moved in 2017 I was living 4.5 miles away from my job down this beautiful disused old railway line. "Jogging" and eventually running the 9 miles a day to get to and from work caused me to lose 80 lbs. Stupidly once the weight was off I bought a car and stopped and over 3 years the weight came back. So much of this stuff is whether you were conditioned from childhood to be active. You can change that, but you probably won't do it on a treadmill in a gym a couple times a week.