The two articles in Resources below are an excellent review of the still unsettled question: Is there a set point for body weight?
The lead author in both articles is Manfred J Müller. Although both are good articles, I recommend reading only Resource (2) as it is more current and more detailed.
(2) Recent advances in understanding body weight homeostasis in humans [PubMed Abstract ] [Full Text HTML] [Full Text PDF]. F1000Res. 2018 Jul 9;7. pii: F1000 Faculty Rev-1025. doi: 10.12688/f1000research.14151.1. eCollection 2018.