Calculation method of food calories

Generally, it can be found from the food composition table, or it can be accurately measured by a calorimeter. Put the sample to be measured into the combustion chamber of the calorimeter for complete combustion, and use water to absorb all the released energy. When one milliliter of water rises once at normal pressure, it needs to absorb 4. 187 Joules, record the changes of water quality and water temperature, and convert accordingly.

The heat of food samples is defined as: 1ml (with the mass of 1g). The heat required for each increase of 1 degree Celsius is 4.8 17 joules when heated.

Extended data:

Taboos for eating:

1, can't eat with soybean milk.

Eating an egg when drinking soybean milk in the morning, or boiling the egg in soybean milk, is the eating habit of many people. Soybean milk has a sweet taste and many nutrients, and it has a strong nourishing effect when drunk alone. However, there is a special substance called trypsin, which, when combined with ovalbumin in egg white, will cause the loss of nutritional components and reduce their nutritional value.

2. Don't eat eggs raw

Eggs contain avidin, which will affect the absorption of biotin in food and cause symptoms such as loss of appetite, general weakness and muscle pain. Eggs will carry bacteria during the formation process, and immature eggs can't kill bacteria, which is easy to cause diarrhea. The protein structure of raw eggs is dense, and a large part of them can't be absorbed by human body. Only after cooked eggs, their protein will become soft, and human gastrointestinal tract can be digested and absorbed.

3. Avoid soaking boiled eggs in cold water.

Some citizens often soak boiled eggs in cold water, and use the principle of hot expansion and cold contraction to make eggshells easy to peel off, but this practice is unsanitary. Because there is a protective film on the surface of fresh eggs, the water in the eggs is not volatile and microorganisms are prevented from invading. After the egg is cooked, the membrane on the shell is destroyed, and some gas in the air cavity of the egg escapes. At this time, when the egg is placed in cold water, the temperature in the air cavity will suddenly drop and show negative pressure. Cold water and microorganisms can enter the egg through the pores on the eggshell and the double-layer membrane in the shell, which is easy to rot and deteriorate during storage.

4. Eat less overnight eggs and tea eggs.

Eggs that are not fully cooked will breed bacteria overnight, and eating such spoiled eggs will be harmful to health.

Because protein has been destroyed when cooking, and it is overnight, the nutritional value will be reduced a lot. In the same way, you should also pay attention to eating less tea eggs once cooked and then boiled. Because the substances in tea mixed with protein will produce harmful substances.

5. Don't eat persimmons immediately.

Eating persimmons after eating eggs will lead to food poisoning, but it will lead to acute gastroenteritis and lung stones. Generally speaking, eating these two foods at the same time will lead to acute gastroenteritis symptoms such as vomiting, diarrhea and abdominal pain.

Therefore, if you take it within1~ 2 hours, you can use the method of inducing vomiting. Immediately take 20g of salt and add 200ml of boiling water to dissolve it, and then drink it once after cooling. If you don't vomit, you can drink it several times to quickly promote vomiting.

6. Don't eat sugar immediately.

Eggs can't be cooked with monosodium glutamate, which I believe many housewives already know. But you may not know that eggs can't be cooked with sugar or eaten with sugar.

Many places have the habit of eating poached eggs in sugar water. In fact, it will make the amino acids in the protein of eggs form a combination of fructosyl lysine. This substance is not easily absorbed by the human body, so it will have adverse effects on health.

7. Don't drink tea immediately.

Some people are used to drinking tea immediately after eating high-quality protein foods such as meat, eggs and seafood, so as to help them "smell" and "digest". In fact, this practice is unscientific. Because tea contains a large amount of tannic acid, tannic acid and protein synthesize astringent protein tannic acid, which slows down intestinal peristalsis, thus prolonging the retention time of feces in the intestine, which not only easily causes constipation, but also increases the possibility of toxic substances and carcinogens being absorbed by the human body, endangering human health.

Baidu encyclopedia-eggs-calorie information

Baidu encyclopedia-food heat meter

People's Network-Eggs can't be eaten casually? 7 taboos for eating eggs