The origin of summer solstice
Solstice is the earliest of the 24 solar terms. In the 7th century BC, the shadow of the sun was measured by civil soil gauge, thus the summer solstice was determined. The annual summer solstice begins on June 2nd1day (or 22nd) and ends on July 7th (or 8th). According to "Zunxian Manuscript", "The sun arrives in the north, the days are long and the shadows are short, so it is called the summer solstice. At best, it is excellent. " On the day of summer solstice, the sun directly reaches the northernmost part of the year, almost directly to the Tropic of Cancer (23 26' north latitude), and the daytime in the northern hemisphere reaches the longest, and the farther north it is, the longer it is.
For example, the daily length of Haikou in Hainan is a little more than 13 hours, Hangzhou is 14 hours, Beijing is about 15 hours, and Mohe in Heilongjiang can reach 17 hours. At the same time, for the Tropic of Cancer and its north, the summer solstice is also the day with the highest sun height at noon in a year. In Beijing, the height of the sun is as high as 73 32' at noon from summer to Sunday.
After the summer solstice, the position of the direct sunlight on the ground gradually moved southward, and the days in the northern hemisphere began to shorten day by day. For the Tropic of Cancer and its northern area, after the summer solstice, the height of the noon sun will also decrease day by day. There is a folk proverb that "eating noodles on the solstice in summer will shorten the day". At this time, the southern hemisphere is in the middle of winter.
Summer solstice health food
1, cucumber
"Seeking Truth from Materia Medica" mentioned that cucumber "tastes sweet and cold, which can clear away heat and benefit water", so it is good to eat more cucumbers in hot summer. The water content of cucumber is 96%~98%, which is the highest among vegetables. It contains very tender cellulose, which plays a certain role in promoting the excretion of rotten food in the intestine and lowering cholesterol.
2, bitter gourd
Chinese medicine believes that bitter gourd is bitter in taste and cold in nature, which can clear away heat and purge fire. The bitter taste of bitter gourd can stimulate the secretion of saliva and gastric juice, greatly increase appetite, and also have the effect of clearing away heat and preventing heatstroke. Bitter gourd, whether it is cold salad, stir-fry or soup, can achieve the purpose of "removing fire" as long as it can be done well without losing its "cyan".
Step 3: tomatoes
Tomatoes are sweet and sour, and have the effects of clearing away heat and toxic materials, cooling blood and calming liver, invigorating stomach, promoting digestion, promoting fluid production to quench thirst, nourishing blood and stimulating appetite. A large amount of vitamin C is an essential component of human connective tissue, which can increase the strength and elasticity of cartilage, vascular wall tubes, ligaments and bones.
4. Pumpkin
Pumpkin has the effects of invigorating middle energizer, invigorating qi, moistening intestine and relaxing bowels. It contains nutrients such as protein and amino acids, and is also rich in carotene, which can protect eyesight, improve blood sugar and strengthen the qi of heart and kidney.
5. Duck meat
Duck meat is cold, rich in protein, and because it belongs to waterfowl, it can nourish the stomach, promote fluid production and soften blood vessels whether cooking porridge or soup, so it is a rare cool food in meat. Many people eat too lightly in pursuit of cooling off summer heat, which leads to insufficient intake of protein and weak constitution. In fact, crucian carp, chicken and loach, including lean pork, etc. , all have the effect of clearing away heat and relieving summer heat, so you can eat with confidence, and be careful not to eat too much. However, mutton, beef, dog meat and other hot foods need to be selected in moderation.
6. Corn
Corn nourishes the stomach, dehumidifies and benefits water. Suitable for diarrhea due to spleen deficiency and damp-heat diarrhea.
7. Broccoli
There are two kinds of cauliflower, white and green, which have the functions of stimulating appetite, promoting fluid production to quench thirst and relieving fever and toxicity, and are also rich in vitamins C, B and carotene.
8.loofah
Luffa has the effect of clearing away heat and relieving summer heat. Ancient medical books and their compendium of materia medica all say that loofah can "clear away heat and benefit intestines". Eating loofah soup in summer can relieve the heat. When cooking soup, it should not be cooked for a long time, and it is best to keep the bright green of loofah. The skin of towel gourd and its flowers boil water together instead of tea, which also has the function of heatstroke prevention and antipyretic.
9.eggplant
"Compendium of Materia Medica" says that "eggplant is sweet, cold and non-toxic. Indications are cold and heat, strain of five internal organs and plague. Eating eggplant can disperse blood and relieve pain, remove dysentery and diuresis, reduce swelling and moisten intestines. " "Outline of Medical Forest" says that eggplant is "wide in the middle, dispersing blood and stopping diarrhea". Modern medical research shows that the rich vitamin P in eggplant can enhance the adhesion between cells, prevent and treat microvascular embrittlement bleeding and promote wound healing. Therefore, eating eggplant often can prevent and treat diseases such as cerebral hemorrhage, hypertension and arteriosclerosis, and also has a certain therapeutic effect on chronic gastritis.
10, spinach
Spinach can nourish blood, moisten intestines and quench thirst. In order to avoid the formation of calcium oxalate from oxalic acid and calcium in spinach, it is suggested to blanch it with hot water first, and then eat it after removing oxalic acid.
1 1, wax gourd
Wax gourd has a good effect of clearing away heat and relieving summer heat. In summer, eat more melon to quench thirst, relieve summer heat and diuresis. Because it is a diuretic and contains very little sodium, it is a good product to reduce swelling of chronic nephritis edema, malnutrition edema and pregnant women edema. It contains a variety of vitamins and trace elements necessary for human body, and can regulate the metabolic balance of human body.
12, lotus root
Lotus root has the effects of clearing heat, calming nerves, cooling blood and removing blood stasis, and contains minerals such as vitamin B, phosphorus and iron, which can improve anemia, diminish inflammation and bacteria, reduce blood lipid and lower blood pressure.
13, mung bean
After work, drinking a bowl of mung bean soup will make you feel refreshed, thirsty and relaxed. This is because mung beans have the functions of clearing heat, quenching thirst and diuresis.
14, crucian carp
Carassius auratus can strengthen the spleen and promote diuresis, which is suitable for spleen deficiency, stopping stomach and diarrhea. Not suitable for frying shepherd's purse.
Dietary taboos in summer solstice
1, invigorating spleen and eliminating dampness
On the solstice after midsummer, it is "hot and wet". In diet, we should give priority to nourishing, strengthening the spleen and eliminating summer heat and dampness. Spleen governs moisture transport, and the spleen and stomach function well, and excess moisture can be transported out.
Step 2 prevent heatstroke
In hot summer, a series of physiological function changes will occur in human body's temperature regulation, water and salt metabolism and digestive system. So pay special attention to heatstroke prevention.
3. Prevention of cardiovascular diseases
Chinese medicine believes that the main fire in summer should be in the heart; Western medicine also believes that in hot weather, the blood flow in the body will accelerate and increase the heart load. Therefore, at the beginning of summer solstice, we should maintain our heart and adjust our mood. We should not get angry at will to prevent hypertension and cerebrovascular accidents.
4, prevent greed, get air-conditioned disease.
People will sweat a lot or relax their pores after taking a bath. At this time, if the air conditioner is turned on too hard, the temperature difference between indoor and outdoor is too large, which is easy to cause a cold. Generally, the difference between air conditioning temperature and outdoor temperature is 4℃.
5. Prevent fever and eczema
The hot and humid weather from summer solstice provides conditions for the onset of skin diseases, and it is also easy to cause beriberi, eczema and other diseases. Usually, we should pay attention to the choice of clothing materials to avoid staying in wet places for a long time.
It is said that a "summer" will be very cold, but we can't ignore our health for a moment. Everything should be moderate, and once it is excessive, it will easily lead to various problems. I hope that after reading this article, you should pay more attention to the summer solstice and don't get sick!