people have been losing weight by a variety of methods
Surprisingly, they have not.
Before GLP1s, weightloss was a myth. 99. something % of people (edit 99.2% of women) who meet the medical definition of obese will always be obese despite a lifetime of effort.
We know for certain from decades of research that weightloss from willpower alone, even with diet plans or excersize plans is functionally impossible. The best they do is yoyo effects - no diet has ever produced perminant weight loss on a real scale.
Very rarely a statistically insignificant sample size enjoy permenant weight loss and these individuals are held up to show it's possible and you can do it too! But that's just not true, and we know it's not true because decades of stats show again and again that perminant weight loss just does not happen.