The difficulty lies in the fact that the person doesn't want to lose weight badly enough. 😉
Let a doctor tell that same person that losing weight is a matter of life or death. Watch how much free will and will power they manage to muster.🤣
The downside to weight loss alternatives (surgeries and medication) is that because it doesn't require much in the way of will power, many of those same folks end up gaining weight again. 😁
Same goes for lottery winners. Many of them end up broke because their free will and will power is broken.😎