Yeah. I do believe we have a certain set point in regards to bodyweight and body composition. Now this is not a precise point, per se, but rather a range.
Where this range is and how big it is depends on the individual. For example, I would argue that my body weight setpoint range is around 93-100kgs. Just living life regularly I would most likely end up hanging around there. Eating my way up from there would require putting in concious effort towards getting food in. So, this is where I naturally gravitate towards.
It’s actually been studied that certain people, who we call hardgainers unconciously increase their activity levels if they overfeed. I don’t have the study at hand right now. What’s curious is that this did not occur in all of the people, which could be used as an argument against the setpoint theory. It could also be that these people were in the lower end of their setpoint or that they just have such a wide scale that they did not reach the top end for some other reason.
Another argument against setpoint theory would be people who are 500-600 pounds. That brings me to another thing:
Bodyweight settling point is the weight you settle at with your current lifestyle. So it’s not neccessarily the weight/bf% you naturally go towards by just living, but rather the sum of that and your exercise habits, food choices etc.
If you float far away from your setpoint eange you will notice it. Go real far under it and you’ll be hungry, tired, can’t sleep, your NEAT goes down: your body is trying to conserve energy. Go far over and you’ll notice that eating is a chore. That’s both due to the amount of food you have in your system as well as increased leptin levels caused by an increased in body fat. Of course this is a simplification, but you get the point.
Now, BF setpoint range can be adjusted upwards rather easily, as you gain new fat cells. With time you may develop leptin resistance, which works similarly to insulin resistance. That means you wont feel as full and as satiated anymore. In addition to that, if your stomach is always full you may mess up your cholecystokinin signaling, which is basically your body’s way of telling you that you are full. If that does not work you’ll feel like your stomach was empty all the time. I’m pretty confident in saying that these factors play a part in people becoming morbidly obese, along with other factors of course. And I’ll admit that I don’t know even half of those. Probably not even a tenth.
This kind of became a ramble of sorts. But yeah, could be that your range has adjusted.