Zhejiang Rufu Network July 27th, the summer weather is hot, we all like to eat watermelon summer heat, usually can not eat the watermelon wrapped in plastic wrap put refrigerator. However, in recent days, there is a warning in the WeChat circle of friends: “Watermelon covered with plastic wrap and put it in the refrigerator... can kill people!†Is this true? How can the watermelon be preserved to reduce bacteria? What about growth? Packed with plastic wrap bacteria but more Recently, the message "The overnight wrapped watermelon wrapped in plastic wrap cannot be eaten" was spread. Ms. Zhao, a 50-year-old from Hefei, Anhui Province, died of vomiting, diarrhea, and fever after eating half of the watermelon wrapped in plastic wrap and left in the refrigerator for two days. Sources said that watermelon covered with plastic wrap will increase the mortality rate of consumers, because cling film will cause bacteria to breed more quickly. Since then, some media have conducted experiments. In the experiment, the workers sampled the surface of the cut surface of watermelon, 4 cm below the surface, and 8 cm below the surface. Samples were taken at 1 gram per site and were crushed and placed in the medium. Twelve hours later, dense colonies were distributed in the three samples. The experimenter said that the number of bacteria is difficult to count and needs to be calculated in hundreds of millions of units, among which, the surface of the bacteria is the most. Finally, we came to the conclusion that hundreds of millions of watermelon bacteria were overnight, and we appealed to everyone to throw away the overnight watermelon. Subsequently, a CCTV program also made related experiments. The results showed that after 4 hours of refrigerating, the number of bacteria in the plastic wrap was 65, which was higher than that of the unsealed watermelon. After waiting for 20 hours, the watermelon content of the unwrapped watermelon film was 80 per gram. In the case of the watermelon with the plastic wrap, the bacterial content was as high as 210 per gram. Experts inferred that the watermelon covered with plastic wrap did indeed promote the growth of bacteria. Fresh-keeping film promotes bacterial growth Why are there more watermelon bacteria wrapped in plastic wrap? Experts from the Center for Food and Nutrition Information Exchange, Geng Guangfeng, introduced that after wrapping the cling film, a relatively closed space was formed between the fruit and the cling film, which provided better conditions for the bacteria to multiply. “The cling film is produced at high temperatures and cannot carry bacteria itself. The bacteria in the cling film should be improperly stored after being unpacked. Water content and taste of the watermelon covered with cling film must be better than those without cling film. Good because the food is easily oxidized after contact with oxygen, and the oxygen film is relatively less after the plastic wrap is tightly packed. The 'fresh' in the cling film means that the water is retained, so that the nutrients will be lost less. In addition, the speed of bacterial growth depends on two points. One is the extent of food contamination, and the other is the preservation of food. The number of colonies after the cut watermelon covered with plastic wrap is higher. This can not be regarded as only a problem of cling film. Whether the cutter and the cutting board of the cut watermelon have been cleaned and sterilized is also the key. Then, if you want to eat watermelon, do you need to wrap the plastic wrap? For this, experts say that if there is a separate storage space for the watermelon in the refrigerator, it will not cause odor, and will not cause water loss. Therefore, it is not recommended to cover the plastic wrap. Do not refrigerate for more than 24 hours How to save watermelon in summer? Yan Guangfeng reminded that, in view of the fact that storage time cannot be known, try not to buy watermelons that have been cut and covered with plastic wrap on the fruit stand. The maximum length of watermelon covered with plastic wrap or directly in the refrigerator should not exceed 24 hours. When you take out the watermelon in the refrigerator, you can first surface about 1 Thick section cut off. If covered with cling film watermelon, it is best placed in a 0 °C -4 °C refrigerator, this environment can inhibit bacterial growth. What needs to be reminded is that if the fruit knife and the cutting board are contaminated by bacteria, it will also affect the quality of the watermelon. Zhai Guangfeng reminded him to separate the fruit knife from the kitchen knife. If you cut a watermelon with a meat-cutting knife, not only bacteria but also pathogenic bacteria are likely. Before you cut the melon, remember to use hot water repeatedly to heat the knife. In addition, the choice of cling film should be careful. The main components of cling film sold on the market are polyethylene (pe), polyvinylidene chloride (pvdc) and polyvinyl chloride (pvc). The first two kinds of safety are guaranteed, but PVC's cling film is less safe and is not recommended for purchase. Eat watermelon dinner weight loss it? Many people use watermelon instead of dinner to achieve a weight-loss plan. However, the recent online heat transmission "eat a watermelon equals six bowls of rice." This is a statement that people can't afford to hurt. Is watermelon's calories really as high as rumor? Fan Zhihong, associate professor of nutrition and food safety at the Food College of China Agricultural University, pointed out that many people think that watermelon is a diet food with very low fat and low energy. However, in fact, although the fat content of watermelon is extremely low, there is sugar. The sugar content of commercially available watermelon is about 7%-8%, calculated according to 7%, 500 grams of watermelon meat contains 35 grams of sugar, 2 grams of sugar in the melon meal is more than 70 grams, equivalent to eating a bowl of rice carbohydrates (100 grams of rice contains about 77 grams of carbohydrates). A medium-sized watermelon has 8-10 pounds of weight, half a melon has 5-7 pounds, and a family of 3 can easily eat half a watermelon after dinner. In terms of calories, this means eating a bowl of rice every day and naturally losing weight. So, how to eat watermelon can not increase fat? Fan Zhihong reminded, normally eat two or three pieces a day, it does not need to eat a few kilograms at a time. At this time, watermelon plays the role of fruit. Every day in the diet, various kinds of food have their own share. If you really want to eat more watermelon, you need to take up the share of other types of food. For example, because watermelons bring sugar, and the metabolism of sugar and starch in the body is similar, some staple foods need to be reduced to make up for it. However, watermelon contains less protein and B vitamins than staple foods, so you need to add more milk, eggs, or fish as a supplement. In this way, nutritional balance can be maintained. Another option is to increase the exercise and consume more calories from this bowl of rice. However, due to the extreme heat in the summer, people do not advocate long hours of exercise when the temperature reaches 35°C. Therefore, you must avoid eating too much fruit after a meal, because doing so will only increase fat. "This fat increase is definitely not a muscle increase. The upper body is full of fat." (Source: Jinghua Times Qian Yuyang Xia Wen) Disposable Paper Tube,Custom Disposable Paper Tube,Medical Paper Tube,Disposable Medical Paper Tube Hengshui Qifei Paper Products Co. LTD , https://www.hengshuiqifei.com