Losing weight is a comprehensive and complicated process, which does not mean that any exercise or food is necessary to lose weight. Only by grasping the same principle can we lose weight without sticking to rigid weight loss rules. The diet to lose weight needs sufficient nutrition and proper calories, the exercise to lose weight needs a lot of low-intensity exercise, and the psychology to lose weight needs to be calm, positive and specific, which is related to personal taste, sports ability, hobbies and personality environment. There is no universal diet to lose weight, and there is no universal exercise plan to lose weight once and for all.