But obesity isn't that simple.
I've been a gym goer for 20+ years. Literally 4-5 times a week, lifting weights, cardio, pilates etc. My average daily step take according to my fitbit is 15,000 steps.
Pre-covid, I spent a year working out with a PT who also had nutrition expertise. I was seriously strong and fit and healthy, but my weight put my in the 'obese' category. I needed to lose about a stone to a stone and a half. No matter what we did, I literally couldn't lose weight. I came off the pill to see if that made a difference (it didn't). For an entire year, we tracked my macros and micros and monitored literally everything I ate. I had a whole spreadsheet (devised by my PT), that tracked all inputs/outputs and nothing.
I went to the doctor, and said that I had all this data that showed what movement I was doing. They sent me for blood tests, all of which came back clear. The GP then referred me to the hormone clinic at the hospital, saying that they felt that there was something clearly strange because on paper, I was doing everything "right" but nothing was working.
You want to know what the hospital's response was? "Well, her bloods are clear so you should tell your patient to try doing some exercise once in a while". I remember the nurse apologising to me, saying she couldn't believe that was their comeback.
Now, I've probably put more weight on. I'm still doing 12-15k steps a day, working out a lot. I burn around 2,600 cals per day, but only eat 1300-1400 cals a day but still cannot lose weight.
Yet I know that the doctors will ignore me if I say its a problem.