Sugar is sweet and salt is salty, because all substances have their own characteristics. Sugar is sweet because of its characteristics. If I ask you, "Why is sugar sweet?" You can probably only answer, "Because it's sugar." However, the feeling of sweetness can only be produced by putting sugar on the tongue. However, even if sugar is put on the tongue, it can make the tongue feel less sweet. Please try to put a crystal sugar in the center of your tongue, and a grain of salt will do. How's it going? You don't feel sweet or salty. This is because the center of the tongue can't tell the ups and downs. Tongue also has structural or physiological characteristics. There is a subject called chemistry, which studies the properties of objects and their changes. So, how to distinguish sugar and salt according to their properties rather than their taste? In fact, there are many ways.
Harm of sugar to health
Sucrose should not be taken in large quantities.
Sucrose is the highest calorie carbohydrate. Excessive intake can cause obesity, arteriosclerosis, hypertension, diabetes and dental caries.
It is not advisable to eat a lot on an empty stomach.
British scientists have found that eating a lot of sugar on an empty stomach will suddenly raise blood sugar, destroy the balance between acid and alkali and various beneficial microorganisms in the body, and is not conducive to human health.
Excessive consumption affects children's development.
Eating too much sugar will affect the consumption of body fat and cause fat accumulation; Eating too much sugar can also affect calcium metabolism. Some scholars believe that if the consumption of sugar reaches 65,438+06-65,438+08% of the total food consumption, the calcium metabolism in the body will be disordered and the calcification in the body will be hindered. A survey in Japan shows that the fracture rate of children has increased, and they think that too much sugar is an important cause of fracture.
Eating too much sugar will make people feel full and have poor appetite, which will affect food intake and lead to various nutrient deficiencies. Children's long-term high-sugar diet directly affects the growth and development of children's bones, leading to rickets. If children eat too much sugar and don't pay attention to oral hygiene, it provides good conditions for the growth and reproduction of oral bacteria, which is easy to cause dental caries and oral ulcers.
In order to avoid diseases such as dental caries, myopia, rickets and digestive tract, the World Health Organization appeals to parents not to let their children eat too many sweets.
Sugar is one of the important substances for human survival.
Sugar is one of the three nutrients in human body and the main source of heat energy. The heat energy provided by sugar accounts for about 60 ~ 70% of the total heat energy needed by human body. Except cellulose, all sugars are sources of heat energy.
Sugar is the most abundant organic compound in nature. Sugar mainly exists in cereals, cereals, potatoes, beans, rice flour products, vegetables and fruits in various forms of starch, sugar and cellulose. It accounts for about 80% of its dry matter in plants, and the sugar in animal food is very small, accounting for about 2% of its dry matter.