1, precautions for eating watermelon
First of all, diabetics
Watermelon contains about 5% sugar, mainly glucose, sucrose and some fructose, which means eating watermelon will increase blood sugar. Normal people can keep their blood sugar and urine sugar at a normal level because they can secrete insulin in time. People with diabetes are different. Eating too much watermelon in a short time will not only increase blood sugar, but also lead to acidosis and even life-threatening due to metabolic disorder. The daily intake of carbohydrates (carbohydrates) by diabetics needs to be strictly controlled. Therefore, if you eat watermelon many times a day, you should reduce the amount of meals and flour products (carbohydrates) accordingly, so as not to aggravate your illness.
Second, renal insufficiency.
In patients with renal insufficiency, the function of expelling water from the body is greatly reduced, so edema of lower limbs or whole body often occurs. If this kind of patients eat too much watermelon, they will consume too much water and can't excrete excess water in time, which will lead to excessive water storage in the body and increased blood volume, which will not only aggravate edema, but also easily induce acute heart failure. Therefore, patients with renal insufficiency should eat less or not eat watermelon.
Third, the early stage of a cold.
Traditional Chinese medicine believes that both wind-cold colds and wind-heat colds belong to exterior syndrome in the early stage, and should be treated according to syndrome differentiation. It is believed that the attack will aggravate the condition before the surface is solved. Watermelon has the function of clearing away heat. Eating watermelon at this time will aggravate the cold or prolong the course of disease.
Fourth, patients with oral ulcers.
Traditional Chinese medicine believes that oral ulcer is caused by internal heat due to yin deficiency and disturbance of deficiency fire. Because watermelon has diuretic effect. If people with oral ulcers eat more watermelons, the water needed for the recovery of oral ulcers will be discharged too much, which will aggravate the internal heat due to yin deficiency, lengthen the course of disease and make it difficult to heal.
Verb (abbreviation for verb) pregnant
Maternal physique is relatively weak, Chinese medicine believes that eating more watermelon will be too cold and damage the spleen and stomach.
Sixth, it is not suitable to eat before and after meals.
Because a lot of water in watermelon will dilute the digestive juice in the stomach, eating watermelon before and after meals will affect the digestion and absorption of food. Eating a lot of watermelon before meals will occupy the volume of the stomach and greatly reduce the intake of various nutrients during meals, especially for children, pregnant women and lactating mothers. For people who want to lose weight by dieting, eating watermelon before meals is a good way to reduce their food intake.
Seven, watermelon should not eat more.
Because watermelon belongs to "cold food", anyone who eats too much will hurt the spleen and stomach, leading to poor appetite, indigestion, decreased gastrointestinal resistance, and abdominal distension and diarrhea.
Eight, eat less iced watermelon.
Although eating iced watermelon on a hot day has a good effect of relieving summer heat, it is very irritating to the stomach and is easy to harm the spleen and stomach, so we should pay attention to grasping the delicious temperature and quantity. Watermelon is best placed on the lowest floor of the refrigerator, where the temperature is about 8- 10℃, and the temperature is also the best. Don't eat more than 500 grams of watermelon at a time. Chew slowly. For people with dental caries (tooth decay) and tooth allergies, they will feel sour and painful after catching a cold, and people with poor gastrointestinal function are not suitable for eating iced watermelons.
2. The secret of buying watermelon
1, look at the color and listen. Melons with smooth surface, clear patterns, obvious lines and yellow bottom are ripe melons; The surface is fluffy, dull and mottled, which is an immature melon; Playing a melon with your fingers and hearing the sound of "pengpeng" is a ripe melon; Those who hear the sound of "Dangdang" are not ripe, and those who hear the sound of "poop-poop" are ripe melons.
2, look at the melon handle. Green is ripe melon; Dark brown, fluffy, fragile, curly beard tip turned yellow and withered, which is a melon picked prematurely; The handle of the melon has dried up and it is a "dead vine melon" with poor quality.
3. Look at the head and tail. The two ends are symmetrical, the navel and pedicel are deeply sunken, and the good melon is full around; The quality of melons with big head and small tail or thick pointed tail is poor.
4. Specific elasticity. The skin of melon is thin, and it is fragile when pressed by fingers, which is a cooked melon; Scraping with nails will crack, and the melon will be soft and ripe.
5. Use your hands. Those who feel empty are ripe melons; All that feels heavy are raw melons.
6. Try the specific gravity. It is ripe melon that floats when thrown into the water; It is the raw melon that sinks.
7. Look at the size. The same variety, the big one is better than the small one. There is a certain relationship between the size and maturity of watermelon. The giant watermelon is not the earliest ripe, but it is definitely not the latest ripe, usually in the middle of watermelon ripening. Therefore, before most watermelons go on the market, it is more likely to buy small and medium-sized watermelons to mature, while it is less likely to mature large watermelons. By the same token, when watermelons are on the market on a large scale, it is not appropriate to buy small melons instead of big ones. Small watermelon may be the abortive vine of early-maturing variety (early-planted watermelon).
8. Look at the shape. The melon body is neat and symmetrical, grows normally and has good quality; Melons are deformed, grow abnormally and have poor quality.
9. Look at the melon skin. Xin Jing No.1, a light green melon skin with dark green net stripes and a nearly spherical figure are their signs. There is also a black beauty. Black-green, slim watermelon is also a sign of choice. In addition, there are some popular varieties in the market, such as Chunhongyu and Jin Xiaofeng.
It should be noted that the quality of a watermelon is fundamentally determined by genes. These varieties mentioned above have been cultivated and selected by gardeners for a long time, and there is a higher chance of producing watermelons with higher sugar content and more water from the beginning of seed germination.
10, observation plant method. Looking up and down from the vine where the melon field is located, it naturally dries up, indicating that the growth of watermelon has naturally ended and the watermelon is mature.