People will go to insane lengths to lose extra weight, including these really extreme methods. Some of them don't even work and many of them are downright dangerous!
Rather than put in the work and diet and exercise, many extremely overweight people will opt to get stomach surgery done. One of these methods is called stomach stapling which involves excising much of the stomach away and only leaving a tiny pouch that can hold about an ounce or so of food. It basically forces you to only eat small meals so you have to lose weight. The surgery is very dangerous however and many people get infections afterward.