1, precautions for eating watermelon
First, people with diabetes
Watermelon contains about 5% sugar, mainly glucose, sucrose and some fructose, which means that eating watermelon will increase blood sugar. Normal people can keep 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 amount of carbohydrates (carbohydrates) that diabetics eat every day 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 the condition.
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 such patients eat too much watermelon, they will consume too much water and can't discharge the excess water in time, resulting in excessive water storage in the body and increased blood volume, which not only aggravates edema, but also easily induces 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 and wind-heat colds belong to exterior syndrome at the initial stage, and divergent treatment should be adopted to solve the disease from the exterior. It is believed that attacking before the surface is solved will aggravate the condition. Watermelon has the function of clearing away heat, so eating watermelon at this time will aggravate the cold or prolong the course of the disease.
Fourth, patients with oral ulcer
In traditional Chinese medicine, oral ulcer is considered to be caused by internal heat due to yin deficiency and disturbance of virtual fire. Because watermelon has diuretic effect. If people with oral ulcer eat more watermelons, the water needed for the recovery of oral ulcer will be discharged too much, which will aggravate yin deficiency and internal heat, and make the course of disease stretch and difficult to heal.
V. Maternity
The maternal constitution is relatively weak, and Chinese medicine believes that eating more watermelon will be too cold and damage the spleen and stomach.
Six, should not be eaten before and after meals.
Because a lot of water in watermelon will dilute the digestive juice in the stomach, eating it before and after meals will affect the digestion and absorption of food, and eating a lot of watermelon before meals will occupy the volume of the stomach, which will 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 food intake.
Seven, watermelon should not eat too much.
Because watermelon belongs to "cold food", anyone who eats too much will hurt the spleen and stomach, leading to poor appetite, indigestion and decreased gastrointestinal resistance, causing bloating and diarrhea.
Eight, eat less ice watermelon.
Although eating iced watermelon has a good effect of relieving summer heat on a hot day, it is very irritating to the stomach and easy to cause damage to the spleen and stomach, so we should pay attention to grasping the delicious temperature and quantity. It's best to put watermelons in the lowest layer of the refrigerator. The temperature here is about 8- 10℃, and the temperature is also the best. The amount of watermelon eaten at a time should not exceed 500 grams, and it should be eaten slowly. For people with dental caries (tooth decay) and tooth allergies who will feel acid and pain after cold, and those with poor gastrointestinal function, it is not suitable to eat iced watermelon.
2. The secret of buying watermelon
1, watch the color and listen to the sound. Melons with smooth surface, clear patterns, obvious lines and yellow bottom are ripe melons; The surface is fluffy, dull, mottled and unclear, which is an immature melon; Playing the melon with your fingers and hearing the sound of "Peng Peng" is a ripe melon; Those who hear the sound of "Dangdang" are not ripe yet, and those who hear the sound of "poop-poop" are overripe melons.
2, look at the melon handle. Green is ripe melon; Dark brown, fluffy, bent and brittle, and the tip of curled beard turns yellow and withered, which is a melon picked prematurely; The handle of the melon has dried up, which 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 melons are full around; A melon with a big head and a small tail or a thick tip and tail is of poor quality.
4. Specific elasticity. The melon skin is thin, and it is fragile when pressed with your fingers, which is a cooked melon; Scratch with your nails will crack, and the melon will be soft, which is overripe.
5. Use your hands. Those who have a sense of emptiness are ripe melons; Those who feel sinking are raw melons.
6. Try the specific gravity. It is ripe melons that float upward when thrown into the water; It is the raw melon that sinks.
7. Look at the size. In the same variety, large is better than small. There is a certain relationship between the size and maturity of watermelon. Huge watermelons are not the earliest ripe, but they are definitely not the latest ripe, usually in the middle of watermelon ripening. Therefore, before most watermelons are on the market, it is more likely to mature if you want to buy small and medium-sized watermelons, but less likely for large watermelons to mature. By the same token, when watermelons are on the market on a large scale, it is not suitable to buy small melons, but big ones. Small watermelons may be abortive vines in early-maturing varieties (early-planted watermelons).
8. Look at the shape. The melon body is neat and symmetrical, with normal growth and good quality; The melon is deformed, the growth is abnormal and the quality is poor.
9. Look at the melon skin. Xin Jing No.1, the dark green net stripes on the light green melon skin and the nearly spherical figure are their signs. There is also a black beauty. Watermelon with black green and slim figure is also a selection mark. In addition, there are some popular varieties on the market, such as Chunhongyu, Jin Xiaofeng and so on.
It should be noted that the quality of a watermelon is fundamentally determined by genes, and these varieties mentioned above have been cultivated and selected by horticulturists for a long time, and there is a higher chance of producing watermelons with higher sugar content and more water from the beginning of their seed germination.
10, plant observation method. Looking up and down from the vine where Guadi is located, it naturally dries up, which indicates that the growth of watermelon has naturally ended and the watermelon is mature.