University of Iowa psychology researcher Kim Johnson and his colleagues found that when mice lack sodium chloride (ie, the salty substance on the table), they are out of the past and change. To be ashamed is to add a lock on the consumption of sugary substances or to give their brains a sensation of pleasant emotions.
"However, the things that pleased the mouse did not make us rush to the spices and made us believe that the lack of salt would cause personal frustration," Johnson said.
The researchers say that not the lack of salt caused all the frustrations, because there are many factors that cause these symptoms, but the lack of pleasure is generally considered an important feature of psychological depression. Also, salt is thought to be a theory of natural substances that can increase mood, and it can help explain why we want to eat it too much, even though it is known to cause high blood pressure, heart disease and other health problems.
Past researchers have confirmed that the average amount of salt per person per day in the world is 10 grams, which exceeds the 4 grams per day recommended by the U.S. Food and Drug Administration, and may even exceed the amount actually needed by the body. More than 8 grams.
Johnson, who works at Liberty College of the Arts and Sciences and Carver University School of Medicine, and graduates Michael J. Morris and Elisa S. Na, published their comments in the July issue of the Journal of Psychology and Behavior. . In the article, they not only expounded their own research findings, but also reviewed other studies on the causes of halophilic behavior.
In everyday life, high levels of salt come from everything from pies to bolognese, but in the past it was impossible. Because the price of salt was high around 2000 BC. At that time it was just discovered as a food preservative. The salary of a Roman soldier is salt; the word “salary†also comes from Latin “saltâ€. Even in the 19th century when the need for salt was reduced after the invention of mechanical refrigeration, excessive consumption of salt continued because people liked its taste and it had become cheap. Today, seventy-seven percent of our salt intake comes from processed foods and restaurant foods, such as frozen foods and fast foods.
Evolution should play an important role in the human desire for salt. Humans have evolved from living things that live in salty seas. Once on the land, the body still needs sodium chloride, minerals play a key role in the exchange and flow of cell fluids, and help neurons to communicate information from the brain to the body. However, when people evolved to hot Africa, sweating robbed the body of large amounts of sodium. Our ancestors ate vegetarian food early and lived far away from the sea, so the lack of salt was particularly evident among them.
"Most of our biological systems need sodium to maintain normal function, but as a species that is not yet fully prepared to approach it, our kidneys are evolving into salt slaves," said Johnson.
We also played an important role in determining whether we had enough salt. Animals like us can rely on the taste system to find salt, and the brain will remember where there is salt resources - such as animals eating salty land while eating grass. When the salt is tasted, the happy function is naturally active in the brain.
So people need salt and know how to find it and how to store it. But today’s scientists find evidence that it has been abused and become an addictive substance—like a drug.
The sign that is considered addictive is that even if it is known that a substance is harmful to humans, it is still used. Many people have been told that they should consider reducing sodium intake for their health, but they are hard to do because they like the taste so they can only look for low-sodium foods.
Another phenomenon known as intense addiction is the growth and amplification of cravings when drugs stop. Experiments conducted by Johnson and colleagues indicate that brain activity has similar changes regardless of mice suffering from drug or salt deficiency.
"This shows that the need and desire for salt will trigger the same brain response as drug dependence and abuse," said Johnson.
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