Body fat drop weight rise may be physiological factors, the proportion of muscle fat more reasonable, or pathological factors such as edema caused. 1. Physiological factors: body fat loss and weight gain is generally a good phenomenon, may be due to physical exercise, fat burning, fat loss, muscle exercise more developed, muscle increase, fat loss, weight may also rise. 2. Pathological factors: body fat loss weight gain may also belong to the pathological state, for example, because of hypoproteinemia, kidney disease, heart disease and other factors to reduce nutritional intake, resulting in fat loss, edema, weight will rise. Edema patients are often accompanied by panic and shortness of breath, back pain and other symptoms. Body fat drop weight rise of the population, exclude physiological factors, to consult a doctor in a timely manner to clarify the cause of the disease, timely treatment under the guidance of the doctor, pay attention to do not eat more too salty food.