That doesn't mean it's not true, though. Obese people do lose a lot of weight when they undereat and depressive people do profit from outside activity, sports, etc.
It's just that life often looks like you cannot do it for various reasons. The complicated thing is of course to find a tiny crack in that bubble of constraints where you can force a change.
Just an example: For many people it would be beneficial to ride a bike to get to work. This alone won't change your body completely, but it is a great start, losing you a couple of hundreds of kcal per day and encouraging more bike tours. But that's obviously not possible for everyone and it is difficult to tell from the outside whether someone just rejects this approach because they are lazy or for valid reasons.
It's just that life often looks like you cannot do it for various reasons. The complicated thing is of course to find a tiny crack in that bubble of constraints where you can force a change.
Just an example: For many people it would be beneficial to ride a bike to get to work. This alone won't change your body completely, but it is a great start, losing you a couple of hundreds of kcal per day and encouraging more bike tours. But that's obviously not possible for everyone and it is difficult to tell from the outside whether someone just rejects this approach because they are lazy or for valid reasons.