There are many explanations for the formation of the platform period, and I think the more reasonable explanation is from the perspective of heat balance.

Based on the most basic understanding of calorie balance, we know that when calorie intake and calorie consumption reach a balance, our weight will show a stable trend. But we are obviously losing weight, right? We try to make our consumption exceed our intake. Yes, it is because of our efforts that we gradually got rid of the influence of obesity, but after we worked hard for a while, our approach may still be the same. At this time, we can no longer guarantee that we consume more calories than we consume. Oh, my God, how can this happen ... Well, after the calorie consumption is less than the calorie intake for a period of time, our bodies will actively reduce their metabolic consumption because they lose weight and consume less calories every day than before (this is also the main reason why strict dieting will enter the platform period faster).

Now, we call the part where we imagine that we consume more calories than we consume every day "lean calories", and the part where our body actively reduces metabolism and consumes less calories is called "unexpected calories" (because it is really a little unexpected). When "lean calories" = "unexpected calories", we once again unexpectedly found that our body's calorie intake and consumption are balanced!

Well, since the heat has reached a balance again, the weight will become a stable trend, which is the explanation of the heat balance formed during the platform period.

Of course, the formation of plateau is not only explained from the perspective of heat balance, but also from the perspective of endocrine or other aspects, but these explanations themselves need more scientific and rigorous proof.