The original meaning of nutrition is "seeking health", which refers to the process that the human body ingests, digests, absorbs and utilizes nutrients in food to meet the physiological needs of the body.

[1] Reasonable nutrition refers to providing enough energy and various nutrients for the body through reasonable diet and scientific cooking, and maintaining the balance among various nutrients to meet the normal physiological needs of the human body and maintain healthy nutrition.

[1] The significance of rational nutrition lies in promoting growth and development, preventing and treating diseases, enhancing intelligence, promoting prenatal and postnatal care, and enhancing the immune function of the body, so as to achieve the goal of health and longevity. Nutrients refer to substances in food that can provide energy, body composition, tissue repair and physiological regulation. At present, there are 40-45 kinds of essential nutrients for human body. [2] Among them, protein, lipids, carbohydrates, vitamins, minerals, water and dietary fiber are the most important nutrients for human body.

Two. Health Overview With the development of economy and social progress, people pay more attention to the quality of life and health. The World Health Organization defines health as "health refers to a good state of physical, psychological and social adaptation, not just the absence of disease or physical health". On this basis, ten standards of health have been formulated: energetic, able to undertake daily life and heavy work calmly without feeling too nervous and tired; Optimistic and positive, willing to take responsibility, no matter big or small, not picky; Be good at rest and sleep well; Strong adaptability, able to adapt to various changes in the external environment; Can resist the common cold and infectious diseases; Proper weight, well-proportioned figure, and coordinated head and shoulder position when standing; Bright eyes, quick response, no inflammation in eyelids; Clean teeth, no dental caries, no pain, normal gum color, no bleeding; Hair shiny, no dandruff; Muscles are plump and skin is elastic. It can be seen that people no longer equate health with no disease, and the concept of health care is more and more widely accepted by people. People maintain a healthy body and a healthy mental state in various ways.

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Third, the relationship between nutrition and health. Nutrition is a process in which organisms constantly take in the substances they need from the outside to maintain their life activities. Human beings maintain life, ensure growth and development, improve health and complete various activities through nutrition. Human beings are inseparable from nutrition from fetus to death, and the quality of human physique is closely related to nutritional status.

[4] Nutrition is a prerequisite for maintaining human life, a material basis for ensuring physical and mental health, and an important condition for human rehabilitation. In short, people's birth and death are closely related to nutrition. And those substances needed to maintain the normal growth and metabolism of the body are called "nutrients". The functions of nutrients mainly include providing energy, promoting growth and tissue repair, and regulating physiological functions.

The basic unit that constitutes the human body is the cell, which constitutes the tissue, the tissue constitutes the organ, and the organ constitutes the human body system. The substances that make up cells come from the nutrients in the food we eat, which are used by the body to nourish the cells in our body. Cell health undoubtedly determines people's health. At present, there are more than forty kinds of nutrients needed by human body, which can be subdivided into seven categories: first, carbohydrates, whose function is to maintain the activity of body cells, mainly come from grains; Second, lipids, whose function is to maintain cell structure and function, mainly come from oils (edible oil, fat, nuts); Third, protein, whose function is to maintain the activity of body cells, mainly comes from fish, meat, beans, eggs, milk and so on; Fourth, vitamins, whose function is to regulate physiological functions, mainly come from vegetables and fruits; Fifth, minerals, whose function is to establish and repair body tissues and regulate physiological functions, mainly come from vegetables and fruits; Sixth, water, whose function is to regulate physiological functions, mainly comes from drinks and soup; Seventh, dietary fiber, whose function is to prevent gastrointestinal diseases and maintain gastrointestinal health, comes from various plant foods.

Reasonable nutrition requires that the percentage of three nutrients in total heat energy is protein 10%~ 15%, fat 20%~30%, and carbohydrate 60%~70%. Protein is an indispensable substance in human tissues, and it is also the main component of various enzymes, antibodies and some hormones. Fat can supply heat energy, form tissue fat and store fat, supply essential fatty acid (linoleic acid), and fat can also promote the absorption of fat-soluble vitamins. Carbohydrate is the food source of heat energy, which can save protein and ensure normal blood sugar, liver glycogen and muscle glycogen to maintain brain activity, liver detoxification and muscle activity.

Fourth, how to achieve reasonable nutrition? First, the dietary structure should be reasonable and diverse. China's traditional eating habits are mainly cereals, and he likes to eat miscellaneous grains. The current health concept holds that in the process of cooking, the combination of meat and vegetables should have thickness. The combination of coarse grains and flour and rice ensures nutrition, and the rice flour in coarse grains can supplement the cellulose needed by human body. Eat more vegetables and fruits with more vitamins, such as radish, celery, Chinese cabbage, bean sprouts, bamboo shoots, oranges, almonds and walnuts. Eat more foods rich in protein, multivitamins and elements such as calcium and iron. Because vitamin C, antioxidant vitamins and trace elements can soften human blood vessels, remove harmful free radicals and protect myocardium. Eat fish, beef and mutton, milk and bean products properly, which is the source of protein. The proportion of pork should be appropriate. Eat less salted, fried and smoked foods, and limit the intake of salt, animal oil, fat meat and animal offal. A healthy human body needs a variety of nutrients, and it is difficult for a single food to satisfy all of them. Only diversification can provide enough protein, vitamins and cellulose, maintain the systematicness of human enzymes, increase resistance and prevent diseases. Secondly, some measures can be taken.

I am a student. As a student, how to achieve reasonable nutrition? Let me talk about some of my ideas: we should carry out active and effective nutrition education among students, hold regular lectures on nutrition knowledge, publish nutrition newspapers and periodicals, offer elective courses on nutrition knowledge, and strengthen publicity and education on nutrition knowledge to improve students' physical quality.

(1) Nutritional knowledge, behavior, attitude and eating habits A The nutritional status of students is closely related to their nutritional knowledge, behavior and attitude. B students' diet, vegetarian diet and nutrition, and the arrangement of three meals a day. c

Students' attitudes and behaviors towards basic dietary nutrients.

(2) Recommendation A Nutrition is a prerequisite for students' physical development. It is necessary to strengthen the education of scientific dietary awareness, increase scientific nutrition knowledge, correct bad eating habits, improve dietary structure and improve students' dietary nutrition level. b

Colleges and universities should strive to create a good campus cultural atmosphere suitable for students' physical and mental characteristics, form a relaxed and orderly amateur living environment, improve students' ability to tolerate setbacks and adapt to life, and use sports science knowledge and related scientific knowledge education to teach students the methods of self-psychological adjustment and psychological relaxation. c

Carry out publicity and education on health care knowledge in various forms to guide students to establish correct social values and outlook on life; Cultivate a good lifestyle, put an end to bad food nutrition and test paper, learn self-medical supervision and inspection methods, and establish good health concepts and healthy behavior habits. d

According to the actual needs of students, colleges and universities should set up some special lectures on sports culture, physical exercise and health, train sports knowledge, diet nutrition and health education, and increase professional instructors for college students to carry out healthy sports.

Summary of verbs (abbreviation of verb) To sum up, nutrition is closely related to health. Nutrition determines a person's voice and appearance. Reasonable nutrition is the cornerstone of health, and unreasonable nutrition is the hotbed of disease. Reasonable nutrition makes people full of energy, strong physique, improve work efficiency, enhance immunity and disease resistance. Reasonable nutrition can make children and adolescents grow up healthily, make adults full of vitality, prolong the life span of the elderly and make patients recover as soon as possible. The goal of nutrition is to keep healthy, prevent diseases and accelerate recovery, that is, to get rid of diseases and strengthen the body.

Therefore, we must change the old traditional ideas, establish a scientific concept of nutrition and health, and truly achieve reasonable nutrition and balanced diet.

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With the rapid development of science and technology, people's material living standards are getting higher and higher, and people who have no worries about food and clothing pay more and more attention to food safety and nutrition. However, there are still many people in life, especially primary and secondary school students, who are not good enough in this respect. For the sake of our physical and mental health and our strong growth, I want to talk about my views on the issue of "food safety and nutrition".

With the improvement of material life, many families take chicken, duck, fish and other meat dishes as their staple food. Although meat dishes can provide protein, fat and other substances that our human body needs, eating meat dishes alone is not enough. Have you found that there are more and more "big fat heads" and "small fat piers" in real life? Vegetarian dishes such as radish and cabbage are cheap but of good quality. They contain vitamins and other substances that are beneficial to the human body and play a vital role in our health. So we should not only eat meat dishes, but also eat more vegetarian dishes. Only when meat and vegetables are eaten together can it be beneficial to our health. We primary school students are in the growing stage and can't be picky about food. The combination of meat and vegetables is more beneficial to health. Then "eat without warning" when eating, and overeating is harmful to your health.

It is not only a problem of balanced nutrition, but also the food safety of primary and secondary school students is very serious. Now around the school, small stalls are full of junk food and "three noes" food. By junk food, we mean foods with high calorie and low nutrition such as instant noodles and ham sausages. "Three noes" food refers to food without product name, factory name and address, production date and shelf life. Primary and middle school students have weak food safety awareness and poor self-discipline ability. It is common to treat junk food and "three noes" food as snacks. Every day after school, students scramble to buy junk food and "three noes" food. These foods not only lack nutrition, but also contain hormones, which do not meet the hygiene standards and will cause harm to the body after eating. Someone in the United States once did an experiment, eating only McDonald's food and drinking only McDonald's drinks for 30 consecutive days. As a result, he was originally healthy, his weight dropped sharply, and his liver, kidneys and other organs were also damaged. This experiment further illustrates the harm of eating junk food. Here, I advise you not to go to McDonald's and KFC fast food restaurants once every three days and eat those foods with high calorie and low nutrition, not to mention other junk food and "three noes" food.

Please remember balanced nutrition and don't eat junk food and "three noes" food. For the sake of our health, I appeal again: everyone must control their mouths, know how to eat scientifically, and develop good eating habits, nutritious diet and healthy diet.