It's possible to lose weight quickly, like losing 10 pounds in a week, but it's usually not worth it. In fact, it could be harmful to your physical and mental health. It's actually best to avoid plans and programs that promise rapid weight loss or extreme results. It's possible to lose 10 pounds in a week.
However, it won't be 10 pounds of body fat. Some of the weight loss is likely due to water. Losing significant amounts of weight quickly is not recommended and can be dangerous.