Metabolism is complicated and there are some really nasty and weird metabolic diseases out there, based on some small regulatory feedback loop being broken. Don't fix a working system!
If your weight bothers you, just go for walk or a swim once in a while. Have a salad.
It is super annoying when people post crap like this, as though that's all it would take to address the obesity epidemic.
By the way, there is approximately zero effect on weight in response to "going for a walk or a swim once in a while".
I acknowledge that there is an issue around cheap food being unhealthy food and people being forced to eat chips for lunch for financial reasons, but for anyone in the middle class or above I really don't understand why it's more complicated than 'move more, eat less'.
It's hard. But it's not complicated.