It's quite loose to lose a catty in five days. Drink more water and pee more every day to help metabolism. Ensure a high-protein, low-sugar, low-fat and low-salt diet, such as steaming sweet potatoes, boiled eggs, boiled chicken breasts and boiled vegetables. If you are a girl, you can't take more than 2 liters of water every day. If you match more than 300 calories a day, such as walking for an hour or jogging for half an hour, the effect will still be quick. You can use some health applications to record your daily diet and exercise and let yourself know your calorie intake and consumption.