Juice wars
In midsummer, all kinds of fresh fruits and vegetables are on the market. Besides eating, many friends also like to make some fruit and vegetable juice drinks. In hot summer, drinking a cold drink is really enjoyable.
Although freshly squeezed juice is much healthier than take-away drinks, the best way to eat fruit is to eat it directly. Except for some people with bad teeth or the elderly, it is best not to drink juice.
Although the sugar, fat and other components of freshly squeezed juice are similar to those of fresh fruit, the biggest disadvantage is that fruit loses a lot of dietary fiber necessary for human body during juicing.
Water-soluble fiber represented by pectin can prevent and reduce diabetes and cardiovascular diseases; Water-insoluble fiber is more used to prevent changes in the gastrointestinal system.
Water-insoluble fiber has the function of intestinal peristalsis and promoting defecation. Dietary fiber can affect the activity of bacteria in the large intestine, reduce the production of cholic acid in the large intestine, dilute toxic substances in the intestine, and reduce the contact time between carcinogens and intestinal mucosa, thus preventing the occurrence of intestinal cancer.
In addition, dietary fiber can also affect the blood sugar level, reduce the dependence of diabetic patients on drugs, prevent excess calories, control obesity, prevent gallstones and reduce blood lipids.
Juicer is easy to produce bacteria.
Drinking fruit juice is not good for children's health, and it is easy to make children lose their teeth, weaken their facial skin and muscle strength, and weaken their eye adjustment function. In addition, long-term chewing weakness.
The mandible will become underdeveloped, the teeth will be irregularly arranged, and the upper and lower teeth will be dislocated. After children's deciduous teeth come out, they should eat some fruits rich in fiber and with certain hardness.
In order to increase children's chewing power, it is healthy and beautiful to affect facial muscles and eye muscles, accelerate blood circulation and promote the development of gums, jaws and facial bones through chewing.
Dr. Fan Zhihong, an associate professor in the Department of Nutrition and Nutrition, College of Food Science, China Agricultural University, said that after juicing fruits and vegetables, nutrition will definitely be lost, mainly vitamins and antioxidants.
For example, when juicing, the high-speed rotating blade destroys cells, and vitamin C in fruits and vegetables will suffer heavy losses when encountering various oxidases.
Antioxidant components such as flavonoids and anthocyanins will also be lost to varying degrees. Insoluble fiber and calcium will also remain in the slag. Therefore, although it is popular to make juice now, it is better to eat fruit directly.
How to reduce nutrient loss by juicing
As long as the fruit is slightly scalded with boiling water first, the oxidase can be "killed" and the fruit and vegetable tissue can be slightly smaller, which is convenient for juicing.
This not only reduces the loss of vitamins, increases the juice yield, but also makes the juice bright and not easy to change color. Especially those vegetables without sour taste, such as carrots, vegetables, celery, fresh sweet corn and so on. Be sure to blanch before juicing.
Home-made juice loses a lot of vitamin C. What about the juice sold in the supermarket? According to nutritionists, for freshly squeezed juice with high juice concentration, high-temperature heating is often used to kill bacteria and ascorbic acid oxidase in the juice in a short time. This ascorbic acid oxidase is the cause of vitamin C oxidation, and homemade juice can't do it.
In addition, the freshly squeezed juice sold in the supermarket is sealed and kept away from the air, so vitamin C is not easy to be oxidized in an air-free environment. Therefore, the content of vitamin C in the processed juice can be guaranteed to some extent.
There are many juice drinks on the market, and the concentration of juice is generally only, so it is difficult to ensure the content of vitamin C, so vitamin C will be added to this part of juice. Although the content of vitamin c is guaranteed.
However, there is no clear research result on the absorption and utilization rate of artificially added vitamin C in human body, so it is uncertain how much vitamin C can be ingested after drinking this kind of fruit juice beverage.
Old people use fruit and vegetable juice instead of fruit and vegetable constipation.
Many old people like to make fruits and vegetables into juice because of their bad teeth, thinking that this will help digestion. Sheng, chief physician of the Department of Gastroenterology, General Hospital of Beijing Military Region, said that juicing vegetables and fruits can not only help digestion, but also cause constipation.
Why is this? Sheng Qiujian explained that vegetables and fruits lost a lot of dietary fiber necessary for human body during juicing. Insoluble fiber can prevent gastrointestinal diseases.
Has the functions of intestinal peristalsis and promoting defecation. In addition, dietary fiber can also affect the blood sugar level, reduce the dependence of diabetic patients on drugs, prevent excess calories, control obesity, prevent gallstones and reduce blood lipids.
This situation is most likely to happen to the elderly, especially those with bad teeth. In fact, a large part of constipation is because the diet is too fine, which leads to insufficient fiber intake.
On the one hand, the delicacy of drinking is reflected in grain, on the other hand, it is also reflected in drinks, especially fruit and vegetable juice should not be used instead of fruits and vegetables. Sheng reminded.
When vegetables and fruits are juiced, cells are destroyed, and vitamin C will be exposed to air for oxidation, resulting in nutrient loss.
Drinking a glass of juice every day has become the habit of many people who love health. Many families have also bought juicers, and the fresh juice and pure juice in the supermarket are also dazzling. The reason why freshly squeezed juice is so popular.
Nature is inseparable from its rich vitamins. Recently, however, the discussion about the nutritional components in freshly squeezed juice is very lively. Some people support that fruit juice is rich in vitamin C, and some scholars think that vitamin C is "lost a lot" after fruit is squeezed into juice.
Even more than 90%. The industrialized production of fruit juice has solved the problem of vitamin C loss by fresh-keeping means, but other problems have filled consumers with doubts.
The loss of vitamin C in fruits is mainly due to oxidation reaction. The scientific name of vitamin C is ascorbic acid, which has antioxidant effect. When vegetables and fruits are squeezed into juice, the cells in the vegetables are destroyed.
Vitamin c will be exposed to air and oxidized. However, the loss of vitamin C is different after different fruits are juiced. The content of vitamin C in cucumber, pear and carrot is less than 1 mg per 100 g, while the loss of vitamin C in watermelon juice is less than 20%.
Conclusion: At present, many people like to eat juicer and use fruit juice instead of fruit, but this will destroy nutrients and easily cause constipation. Let's eat more fruits.