Patient's question:
Here is the translation of the provided text into English, with the specified requirements followed:---
"Which medicine or food should a doctor take to maintain strong sexual function? Which medicine or food is beneficial for the body and provides nourishment, while also being aphrodisiac and healthy? How come I have nearly 200 white hairs on my head? I'm only 24 years old, a man. What food can I eat to keep my sexual function strong?"
Doctor's answer:
There are several factors that can lead to long white hair, such as malnutrition, declining kidney function, etc. In general, as long as you pay attention to getting more rest and maintaining a balanced diet, it can be managed. Common foods that are believed to nourish the kidneys and boost Yang include Chinese chives, chestnuts, dog meat, black beans, and black sesame seeds, which can be consumed regularly. If there are no pathological symptoms, it is not recommended to take oral medications, as this can be very harmful to the body. Regular outdoor exercise, along with additional waist exercises, can help achieve the effects of nourishing the kidneys and boosting Yang.