Pitaya is not very delicious in the morning and at night. Yu Kang, chief physician and professor of clinical nutrition department of Peking Union Medical College Hospital, once said in "Yangshengtang" that fruits should be eaten between meals at 10 and 4 pm. This has two advantages: first, it balances blood sugar and avoids eating fruit immediately after meals, which leads to excessive blood sugar load; Second, it is beneficial to the absorption of nutrients in fruits.