A: This shows that you lose weight too fast and it is easy to cause a rebound. The speed of losing weight without rebounding should be: lose 2 pounds a week, and will come back after losing more weight. The skin is elastic. When the speed of losing weight exceeds the elasticity of skin, there will be a feeling of separation between skin and meat. In fact, this means that the skin will fall off and get old. After a while, if your weight doesn't change significantly, then your skin will be tighter, not forever.