1. Medically, how long does it take to be fasting?

Before understanding this problem, we need to know the capacity of the stomach. The normal stomach capacity is only about 50ml in the fasting state, but the capacity of the stomach can reach 1500~2000ml when full.

Fasting actually refers to "gastric emptying" . Gastric emptying is the process of food entering the duodenum from the stomach, and the emptying time takes 4 to 6 hours . The fasting examination referred to in medicine usually refers to fasting for at least 8 hours, preferably 12 to 14 hours .
Fasting in daily life is not so strict. Many people understand that fasting means that the body is in a state of hunger before eating. So, we often hear in life that eating fruit on an empty stomach will hurt the stomach. Is there any scientific basis?

Second, will eating fruit on an empty stomach really hurt the stomach, leading to gastric ulcer and stomach cancer?

This statement is unscientific. The pH value of organic acids in fruits is generally around 3~5 , while the pH value of our gastric acid is generally below 2 . Comparing the two acidities, the stomach acid is stronger. For normal people, the organic acids in the fruit they eat are not enough to stimulate the stomach, but have a certain neutralizing and buffering effect.

However, some people who have gastrointestinal diseases themselves need to pay attention. These people have inflammation and wounds in the gastrointestinal mucosa themselves. If they eat fruit on an empty stomach, the protease and tannin in the fruit may cause further damage to them, and may also induce Indigestion problems arise.

In addition to fruits that cannot be eaten on an empty stomach, there are many foods in life that cannot be eaten on an empty stomach. Let us see if there is any scientific basis for it.

3. Expose those lies about fasting
1. Can't drink milk on an empty stomach?

In fact, some people have diarrhea when they drink milk on an empty stomach because they have lactose intolerance. According to statistics, there are about 310 million people in China who are lactose intolerant, and nearly 350 million people are suspected to be lactose intolerant. When lactose reaches the intestines, it will cause flatulence, cramps, and even diarrhea and abdominal pain. Such people should avoid drinking milk on an empty stomach, or eat some starchy foods before drinking milk.

2. Can't eat high-sugar foods on an empty stomach?

For people with normal islet function, no matter whether they eat on an empty stomach or not, the sugar they eat can basically be decomposed and processed, and there will be no major problems. However, some patients with diabetes themselves should be careful to eat fine white noodles rich in carbohydrates on an empty stomach, so as to avoid a large increase in blood sugar in a short period of time.

For ordinary people, eating the above foods on an empty stomach will generally not have a bad effect on the body. What we should really pay attention to are these types of foods and avoid eating on an empty stomach.

Fourth, these foods are really not recommended to eat on an empty stomach

1. Wine

Drinking alcohol increases the risk of various cancers such as oral cancer, stomach cancer, and liver cancer. And drinking on an empty stomach is significantly associated with the risk of liver cancer, which may be related to the rapid absorption of alcohol into the blood by drinking on an empty stomach.

2. Spicy and stimulating food

Eating spicy and irritating foods on an empty stomach, such as raw garlic, raw onions or foods with a high degree of spiciness, may directly stimulate and damage the gastric mucosa, and then cause adverse reactions such as stomach pain and stomach cramps.

3. Cold drink

Eating cold drinks on an empty stomach will bring greater temperature stimulation to the gastrointestinal tract, which in turn will cause stomach pain, diarrhea and other uncomfortable symptoms.