Lock up a normal fat man and give him food every day, so he won't starve to death. I can only mention it, but it is getting thinner and weaker.

I want to know why I treat a person like this. If a fat man wants to lose weight, he can control his diet and lose weight reasonably. So don't use such coercive and extreme means. This is often counterproductive, immoral and illegal.

Personal advice should first focus on persuasion and education, so that he can realize that obesity is not good for his health and will bring many diseases.

I hope my answer can help you, and I hope it will be adopted. Thank you!