You won't be thin at all. As for the rebound, all weight loss methods will rebound. Fat is an essential element for human body. As long as you consume too much energy, you will form fat. In order to prevent rebound, you should eat healthily, exercise more, and have a good diet and work and rest. Naturally, it will not rebound and it will be healthy. As for what will never rebound after eating thin, unless technology reaches the point where human genes can be freely adjusted, it does not exist. It is recommended not to eat products that can lose weight in the market. If you want to lose weight, you should rely on your own perseverance, not diet pills.