Hey,

there is this german book “Fettlogik überwinden” (“overcome fatlogic”), which adresses many of these ideas like “there is a setpoint” or “slow metabolism because of a diet” or “my weight is genetic determined”. (These ideas are called “fatlogic”.)

The author Dr. Nadja Hermann compares these ideas with many studies, so these ideas can be falsified or verified. It’s a pity, that there is no english version available.