The shelf life of chocolate in old Shunde is one year. Because chocolate over a year tastes bad, eating expired chocolate will damage your body function. Old Shunde chocolate is a common food, which can obviously improve a person's mood, mainly to stimulate the secretion of some hormones. Chocolate in old Shunde has a silky and sweet feeling, which can melt quickly in the mouth, making the whole person's nervous system excited and stimulating the brain to produce chemical reactions, so it will have many effects on negative emotions in learning. In southern Fujian, many female friends who are in confinement will also eat one or two pieces of old Shunde chocolate every day, so that their mothers' mood will be better, they can better change their roles, adapt to the present situation, and take better care of their babies, and the risk of depression will be greatly reduced.