Select 250g black beans with green heart, wash and fry them, let them cool, add 1000 ml wine, seal them from light, soak them for 3-5 days, and drink them 20 ml each time (once in the morning and once in the evening), and take out 20 pieces of black beans as wine to eat. The main function of wine is to tonify the kidney and improve the memory and sleep of the elderly.