A recent study by American scientists has attracted the attention of the medical community. The study showed that high salt diet can trigger cognitive deficits in the brain of animals, which was published in the world famous journal “Nature – Neuroscience” (Nature Neuroscience) article caused people to reflect on how much salt affects our daily life. Because animal experiments have proved that by feeding mice with food containing 4% or 8% salt, the blood flow in the cerebral cortex of the experimental group of mice decreased by 28%, and after only 8 weeks the blood flow in the hippocampus decreased by 25%, and the mice’s sense of direction and speed of reaction decreased significantly; this study ultimately proved that “a high-salt diet affects the health of the brain, and a high-salt habit leads to changes in the intestinal immune system, which can cause cognitive deficits”. This study conclusively demonstrated that “a high-salt diet affects brain health and high salt habits lead to changes in the gut immune system, which in turn lead to cognitive deficits. Although the conclusion of this study cannot directly infer the consequences of a high salt diet in human beings, it at least gives us a lot of warning that a high salt diet is detrimental to a healthy life. China’s residents dietary guidelines recommend that a person’s salt intake is less than 6 grams a day, of which 2 grams of salt is the amount of salt contained in the food people eat every day, the actual amount of salt used in a day of stir-frying should be 4 grams of salt a day’s intake of salt (6 grams) is equivalent to the amount of an ordinary beer bottle cap paved. In addition to reducing blood flow to the cerebral cortex, eating too much salt can cause high blood pressure, calcium loss, edema, and accelerate the decline of the body’s physiological functions. Recently, more reports have shown that a high salt diet can also cause stomach cancer. It seems to be imperative to stay away from a high salt diet.