If you lose that much in two or three months, it won't harm your health. If there is no such method, even if there is, it will definitely be unhealthy. If it's half a year, it's almost there. Strictly control diet and strengthen exercise, although it is a very old-fashioned way, but it is the healthiest, you can also eat spirulina and chitin together, both of which are very good. In fact, the most important thing is perseverance and determination ~ I just lost 20 pounds in more than 2 months, but the method is unhealthy, so I won't talk about it, hehe.