Almost all of Weibo and WeChat push messages tell us that we cannot eat bananas on an empty stomach. The reasons for not eating are bizarre. Can bananas really not eat on an empty stomach? Who should not eat bananas on an empty stomach? let's figure it out together.
Is it true that eating bananas on an empty stomach will diarrhea?
The saying that bananas help to relieve laxative spreads widely. There are usually two arguments: First, bananas are rich in dietary fiber, and dietary fiber has a laxative effect. Second, bananas are rich in fructose, and fructose has laxativeness. Effects, severe can cause diarrhea. However, it is regrettable that these two arguments are quite untenable.
First of all, let's look at the first statement: It refers to dietary fiber. Dietary fiber refers to the remains of plant cells that cannot be digested by human body in food, including cellulose and pectin. Dietary fiber does indeed have the effect of softening stools and promoting defecation and eating properly and healthy. However, bananas have no special performance in terms of dietary fiber content. Its content is only 1.2g/100g], which is not only lower than that of pears, tangerines, etc., but also much lower than most cereals, vegetables, and almost all. Common mushroom foods. If calculated according to dietary fiber, bananas do not have more prominent laxative capacity than other botanical foods.
Secondly, we will analyze the second statement: Is the fructose contained in bananas really capable of causing defecation or even causing diarrhea?
There is a laxative called "lactulose" in clinical practice. It is a disaccharide consisting of one galactose residue and one fructose residue. The drug cannot be digested and absorbed by the small intestine. After entering the large intestine, it will break down into small organic acids under the action of intestinal bacteria. Together with lactulose, these metabolites can increase the osmotic pressure in the intestine and make the stool softer. Thinning effect. Similarly, if fructose can smoothly enter the large intestine, it can also play the same role. However, the small intestine of healthy people has a powerful and unparalleled digestion and absorption function. Whether it is fructose monosaccharides or fructose in the form of sucrose, the small intestine can be fully utilized. Unless there is a large amount of fructose intake in a short period of time, it is generally rare. Leave the large intestine. Only exceptions such as lactulose can escape the absorption of the small intestine, and fructose contained in bananas is mostly fructose monosaccharides or sucrose. Whether or not it is taken on an empty stomach, it is difficult to reach the large intestine smoothly and play a role in laxativeness.
Why do some people suffer from diarrhea due to eating bananas?
In fact, most diarrhea after eating bananas is often caused by eating unclean foods, or just by coincidence. Another reason for eating bananas after diarrhea is due to hereditary fructose intolerance. Such a patient lacks an enzyme for digesting fructose, so that the small intestine cannot digest, absorb, and utilize fructose, thereby causing severe diarrhea. However, fructose intolerance is a very rare disease that usually occurs in infancy, and not only bananas, but children who eat any food containing fructose will have diarrhea, which is not within the scope of normal investigation.
[Summary of the Truth] In summary, we can confidently say that bananas do not cause diarrhea, and that eating bananas on an empty stomach is certainly not diarrhea.
Is it true that eating bananas on an empty stomach is not good for the heart?
Since bananas are rich in potassium, they can quickly replace the potassium ions lost in patients with diarrhea, then the heart disease people will eat bananas will not appear high potassium and adverse to the heart?
Normal blood potassium concentration is maintained at 3.5 ~ 5.5mmol / L, if serum potassium is higher than this range, whether it is normal or heart disease, there may be fatal arrhythmia, causing sudden death. The normal range of serum potassium concentrations is very subtle, with about 4000 ml of blood in a medium-sized adult. Theoretically, only 312 mg of potassium can be used to raise the potassium concentration from the normal range of 4.5 mmol/L to the dangerous 6.5 mmol/mL. L, and the potassium content of the banana is 256mg/100g, as long as the intake of 122g of banana can make up for this 312mg of potassium. Can we say that bananas can't be eaten? No matter if you are a healthy person or a heart attacker, can you just need more than 100 grams?
Anyone who has had the experience of eating a whole bunch of bananas in one breath can take the opportunity to answer: Impossible. On the contrary, the daily requirement for potassium is very large. A healthy non-pregnant adult needs about 2000 mg of potassium per day. Some people even suggest that healthy people should consume 4 to 6g of potassium per day, and the total amount of potassium in the human body is about There are 140 ~ 150g, these potassium is mainly present in cells, only a very small amount exists in the plasma, and this very small amount of potassium has a great effect on the body's various life activities. Therefore, the human body has developed a set of extremely complex and extremely precise mechanism for regulating blood potassium. Cells are used as a potassium storage pool. When blood potassium is high, they are stored in cells. When blood potassium is low, they are placed in positions to maintain the stability of blood potassium. The surplus potassium ions are excreted through the kidneys. The kidney is the most powerful wastewater treatment plant in the human body and can filter 33,000 mg of potassium per day. Therefore, even if a healthy person consumes 30 grams of potassium per day (approximately 13 tons of bananas), there is no danger of death.
Only those who cannot properly excrete potassium due to impaired kidney or endocrine function are strictly limited to potassium intake. Although severe heart problems can also cause impaired kidney function, heart disease itself does not make people more unfit for potassium intake. Conversely, for patients with hypertension, an important risk factor for coronary heart disease, an appropriate high-potassium and low-sodium diet has a positive effect on controlling blood pressure and hardening of the arteries and preventing the occurrence of myocardial infarction.
[truth summary] Whether or not an empty stomach, eating bananas will not be detrimental to the heart, but can help prevent certain heart diseases, suitable for healthy people and many patients. However, patients with impaired renal function should not eat more bananas to prevent hyperkalemia due to impaired potassium excretion.
Who should eat less bananas
Banana is a starchy, nutritious and beneficial fruit that can be eaten properly. From the perspective of Chinese medicine, bananas are sweet and cold, promote gastrointestinal motility, and can clear away heat and intestines. Therefore, people with spleen deficiency diarrhea should not eat more. Body cold, such as Wei Han (mouth light bloating), nephritis (also Deficiency), Deficiency (diarrhea, easy to faint), pregnancy, foot swelling, do not eat raw bananas. If you want to eat, you can eat bananas after cooking.
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