I have read about Body set weight or homeostasis. If your body does a reset does it reset to your current weight or what you should weigh. I am not sure I understand.
The basic idea, as I understand it, is that your body is predisposed to stay at it’s current baseline weight (i.e., the weight before you start dieting). So if you start dieting and losing weight, your body will fight to get back to the starting weight, which is, in part, why people regain all the weight they lost on a diet after going back to eating off diet.
Resetting would update the baseline weight to your current weight. That way, if you stop actively trying to lose weight, your body should stay at the current weight. However, if you continue dieting and lose more weight, you would need to reset again to maintain the weight loss.
When people gain weight, they tend to stay at a certain weight for an extended period of time. Likewise, when you lose weight, many notice that they plateau at those same weight set points on the way down. I agree that the science here is spotty, however I also believe that Leptin controls these body fat levels as it is the “anti-starvation” hormone. I think of it like the float valve in my toilet. :)
Hitting a plateau or a body set point when dieting does not mean that is what you “should” weigh nor does it mean that you can’t diet down some more from there. It means that your body remembers that was a safe and appropriate level of fat for you sometime in the past.
That is how it is “supposed” to work. Obese people usually have plenty of leptin circulating that should be telling their brain and body to stop eating - but their issue seems to be their “leptin receptors” instead of just the leptin hormone level. This is part of the reasoning behind “cheat meals” - increasing calories (and perhaps carbs) for a while may signal to the body that all is still good and it is safe to drop more weight - and that is reportedly what happens for many people. Who know if the weight would have come off on its own over time without the cheat meal.
I only discovered about three studies in PubMed on the topic, and only one appeared to well done. It supported the additional calories and additional carbs position, however there was no good recommendation of how much or for how long. Others on /r/keto think that just additional calories (or calorie cycling) is sufficient to reset leptin and body fat levels. On the other hand, there have been plenty of stories of people breaking through a plateau by fasting - but is it necessary or is it optimal? Who knows?