Eat walnuts and deep-sea fish to replenish the brain? Then you really don't understand the preferences of our brains.

When it comes to brain tonic, I believe many people will associate it with eating, such as walnuts, deep-sea fish and brain gold. People in China love brain tonic. At this time, the college entrance examination is approaching, and the topic of brain tonic is heating up again. Does the brain really like these various brain tonic products? How can we make up the brain scientifically?

Speaking of the brain, the brain is the highest part of the human nervous system, and the human cerebral cortex is the most developed. It is an organ of thinking, leading all activities in the body and adjusting the balance between the body and the surrounding environment.

The main components of human brain are protein, lipids (mainly lecithin), vitamin B 1, nicotinic acid, etc. Therefore, properly supplementing foods rich in such substances has a certain brain-strengthening effect. But in nature, many foods contain protein, lecithin, vitamin B 1 and nicotinic acid, such as milk, eggs, sunflower seeds, kelp, sesame and so on. Even garlic contains a lot of vitamin B 1 that the brain likes. Therefore, we don't need to take the nutrition that the brain likes from a certain food. "Variety of food and balanced intake of nutrition" is the brain's favorite way to supplement food.

Speaking of food, let's talk about walnuts and deep-sea fish that are often labeled as "brain-strengthening artifacts".

Walnut is often said to strengthen the brain, which is mainly related to its brain-like shape. However, there is no scientific basis for the statement that "shape complements shape". Although walnut kernel is rich in nutrition, it contains protein 15 ~ 20g per 100g, with more fat and carbohydrate 10g. It also contains calcium, phosphorus, iron and other trace elements and minerals, carotene, riboflavin and other vitamins, which are beneficial to human body. But in fact, most nut foods also have these nutrients, and we don't need to take them from walnuts alone. Even though walnuts contain omega-3 unsaturated fatty acids that the brain likes, eggs and beef that we often eat are also rich in omega-3 unsaturated fatty acids. So I really don't need to eat walnuts to replenish my brain.

Moreover, some studies have proved that long-term lack of omega-3 unsaturated fatty acids may indeed affect the normal function of the brain, but extra supplements from food can not "make people smart."

After talking about walnuts, let's talk about another "brain-strengthening artifact"-deep sea fish. Deep sea fish are rich in polyunsaturated fatty acids and minerals. Such as calcium, iron, zinc and other trace elements, but also contains vitamins A, B, C and so on. DHA and EPA, especially DHA and EPA in fish, have an important influence on the development of baby's brain and nerve. So at present, many infant milk powder manufacturers adopt high-tech means to strengthen a certain proportion of DHA, ARA and other nutrients in infant formula milk powder, so as to solve the problem that the lack of polyunsaturated fatty acids in milk affects the brain development of infants.

Although deep-sea fish are rich in DHA and EPA, they also contain methylmercury, which is harmful to human body. Methylmercury is a neurotoxic environmental pollutant. Methylmercury invades the central nervous system, which can seriously cause language and memory disorders.

Therefore, the Nutrition Society of China suggests that you eat fish 2-3 times a week, about 3 times each time, of which at least 1 time is marine fish.

Even though these foods contain protein, lecithin, vitamin B 1, nicotinic acid and so on which the brain likes, there is a process for these substances to transform in the body, which cannot directly act on our brain and needs long-term dietary accumulation. The brain, like other parts of the human body, needs energy to function normally. The best energy source is carbohydrate, because only blood sugar can directly penetrate our blood-brain barrier and provide energy for our brain. Therefore, candidates should never lose weight, eat or deliberately reduce carbohydrate intake during the exam.

In addition, although carbohydrates are important to the brain, don't eat too much. Because if you eat too much carbohydrates and exercise less, the excess carbohydrates will be converted into fat and stored by the human body. Excessive calorie intake will not only increase the risk of obesity and cardiovascular disease, but also reduce the plasticity of synapses and affect learning and memory.

The brain is also afraid of eating too much saturated fatty acids, because it will accelerate the cognitive decline of the brain. Studies have found that if leptin is injected into the brain, it can well restore memory and promote the improvement of learning ability; The endocrine function of obese people is different from that of normal people, which leads to the failure of leptin to play its normal role. So if you want to be smart, remember not to be too fat.

In addition, increasing the dynamic balance between exercise and diet can also promote the improvement of brain cognitive function. Candidates may wish to arrange 60-minute exercise at least three times a week, and appropriately add some strenuous exercise to make their brains more energetic.

Have you remembered all these hobbies of the brain? Here, I wish all candidates success and become the first!