The four-character formula "Three Geng in Summer" indicates the lodging date, that is, from the third Geng day in Xia Hou, the first lodging 10 day, the middle lodging 10 day or 20 days, and the last lodging 10 day. In ancient China, the "trunk-branch calendar" was popular, and 60 groups of different names were used to record dates with 10 heavenly stems and 12 earthly branches, which were recycled. The day with the word "Geng" is called "Geng Day".

The word "Geng" in Geng Day is the seventh word in "A, B, C, D, E, Ji, G, Xin, Ren, Gui" 10 day, and it is repeated every 10 day. Starting from the summer solstice, according to the date of trunk, the third Geng day is the first, the fourth Geng day is the middle, and the 1 th Geng day after beginning of autumn is the last.

What to eat at first, the best nutrient: vitamin E.

It can reduce the strong oxidative damage and high-risk damage caused by sunlight and ozone to a minimum.

Foods rich in vitamin E include: fruits and vegetables, nuts, lean meat, milk, eggs, pressed vegetable oil and so on. Fruits and vegetables include kiwi fruit, spinach, cabbage, cabbage, kale, lettuce, sweet potato and yam. Nuts include almonds, hazelnuts and walnuts.

What to eat at first, the best vegetable: bitter vegetables.

In the early days of hot weather, people are prone to fever, anxiety, thirst, dry stool and other symptoms. In the early stage of health care, people can eat more bitter vegetables to relieve heat and detoxification. Common bitter vegetables are bitter gourd, bitter vegetable, lettuce, radish, dandelion, wolfberry seedlings and so on.