Post: Fang zhouzi: Why is the fruit cold "?

◇ New syntaxes (www.xys.org) (xys5.dxiong.com) (www.xinyusi.info) (xys2.dropin.org) ◇ why is the fruit cold "? · Fang zhouzi · fruits are rich in vitamins, minerals, cellulose and other nutrients, and contain health care substances that can reduce the risk of a variety of chronic diseases. Therefore, nutrition thinks that fruits should be eaten more at ordinary times. For example, the latest US dietary guidelines are recommended for adults to eat 2 ~ 2.5 cup of fruit (1 cup is about 240 ml, refers to the volume after the fruit is cut, not the juice ). However, some people are opposed to eating fruit. For example, Ma yueling, the popular "Health Care teacher", "no ill wisdom" in addition to the sensational raw Loach, there is also a "must stop all cold food to make up for the gas and solid yuan ", this includes not eating or not eating fruit. In traditional Chinese medicine, the vast majority of fruits are indeed classified as cold food: "watermelon, cold", "Apple, cold", "bananas, cold", "Pears, sexual cooling, orange, sexual cooling "...... Many people also think that the fruit is very cold, because they will have diarrhea after eating the fruit. Many foreigners also have diarrhea after eating fruit, although they have never heard of it as a cold food. Therefore, this is different from "cold drinks can have diarrhea". It cannot be classified as a result of the psychological effect of culture, and it has a material basis. So what makes some people suffer from diarrhea when they eat fruit? All fruits are rich in fructose. Will it be caused by this special ingredient? Unbelievable, this was not confirmed by Swedish medical practitioners in their first experiments until 1978. As we learned in biology in middle school, fructose is a simple sugar that can be directly absorbed into the blood by the small intestine without being digested. The actual situation is not that simple. Fructose arriving in the small intestine does not run into the blood like water, but needs a transport-carrier-to run it in. Specifically, the carrier used to carry Fructose is a protein called glu5 on Small Intestine Epithelial Cells. The number of carriers is limited. If there are too many fructose to be consumed, what will happen if the amount of Fructose is too busy? The unabsorbed Fructose is left in the intestinal tract, so that the osmotic pressure of the intestinal fluid is higher than that of the plasma. The water in the plasma is lost to the intestinal tract, and the water in the intestinal tract is more than usual. Fructose becomes the food of bacteria living in the colon. It is fermented to produce short-chain fatty acids and a large amount of gas, which stimulate intestinal peristalsis. Therefore, the excess water in the intestinal tract cannot be fully absorbed, it causes diarrhea. Fructose is the gas produced by bacteria, including hydrogen, which is absorbed by the blood, circulated to the lungs, and released. Therefore, if we can detect hydrogen from our breathing, it indicates that Fructose is not absorbed by the small intestine. Then, let the experiment object drink different amounts of fructose, and then check whether there is hydrogen in their breathing, you can know how much fructose a person can absorb at a time. The result of the experiment is that normal people can absorb 25 ~ 50 grams of fructose. This amount is actually quite large. To get 25 grams of fructose, you need to eat about 430 grams of apple. However, many human bodies lack fructose carriers, or the efficiency of fructose transport is relatively poor, they can absorb less than 25 grams of fructose at a time, it is easy to eat fruit abdominal pain, diarrhea. This situation is known as poor fructose absorption, and dietary fructose intolerance. About half of people have different levels of dietary fructose intolerance. In addition, there is also an hereditary fructose intolerance, which is rare because there is a lack of Fructose-breaking enzymes in the liver, and the fructose absorbed into the body cannot be decomposed, which will lead to hypoglycemia and liver disease, is another disease. Patients with dietary fructose intolerance cannot eat any fruit. Some fruits may have diarrhea, and some may not. What is the problem? It turns out that there is also a carrier in the small intestine called glu2, which can transport both glucose and fructose. It is very inefficient to transport fructose, but glucose can greatly improve its transport efficiency. Therefore, glucose can help to absorb fructose. Whether a fruit can cause fructose intolerance is related not only to the fructose content, but also to the ratio of fructose to glucose. Fruits with higher glucose content than fructose, such as bananas, oranges, grapefruit, pineapple, kiwi, and strawberries, cannot easily cause fructose intolerance. Fruits with higher Fructose content, for example, apple, pear, watermelon, cantaloupe, jujube, carambola, mango, cherry, Lychee, papaya, and grape are prone to fructose intolerance. In addition, honey and the "artificial honey" (Fructose Syrup) added to processed food are also prone to fructose intolerance due to the higher Fructose content than glucose. Some people think that drinking honey can "moisten" and "relax". Besides psychological factors, it may be related to fructose intolerance. In contrast to glucose, titol can reduce the activity of fructose carrier, which is not conducive to the absorption of fructose. Therefore, fruits that contain sugar alcohol, such as peach, plum, and apricot, although the glucose content is higher than fructose may also cause fructose intolerance. There is no medicine for fructose intolerance. The best way to prevent fructose intolerance is to avoid foods with high fructose content and sugar-containing. When eating foods with high fructose content while eating foods with high glucose content, sometimes it can prevent fructose intolerance, but not for everyone. It can be seen that the reason why fruit is considered "cold" will lead to diarrhea is that Fructose is not resistant. Some traditional sayings are justified. But not all. The traditional saying from the word of mouth is that some of them are summed up by experience, while others are just for example. For example, bananas are considered to be "cold", and they can be "moistened" and "Easy to use". Therefore, there is no scientific basis for preventing diarrhea patients. The glucose content of bananas is much higher than that of fructose, and it does not contain sugar alcohol. In fact, in foreign countries, bananas are considered to be able to stop diarrhea rather than being accessible, and are one of the first choices for diarrhea patients. Banana starch containing amylase can protect intestinal mucosa, double-blind control test showed that eating bananas can reduce diarrhea in children. I mistakenly think that bananas can "relax" and "relax" may be due to the association of the shape and viscosity of bananas, and it has nothing to do with experience. 2011.7.25. (China Youth Daily, 2011.7.27) (xys20151128) ◇ (www.xys.org) (xys5.dxiong.com) (www.xinyusi.info) (xys2.dropin.org) ◇