Analysis of Basic Nutritional Knowledge: Dietary Structure Types and the Nutritional Status Survey of Chinese Residents

Food is the most important thing for people. As the saying goes, "Man is iron, food is steel; skip a meal and you'll be starving." For our survival, we need to eat a lot of food every day. But if we examine this carefully, what exactly do we eat every day? What are the functions of these foods? How can we eat more rationally and effectively? These questions aren't based on the idea, as some people say, that "it's pointless to eat," but rather because a balanced diet and good eating habits play a crucial role in maintaining physical and mental health. Understanding some basic nutritional knowledge is beneficial for better planning our diet and maintaining health through eating. Nutrition refers to the process by which the human body maintains and protects its growth, development, health, and adaptation to work by ingesting food from the outside world. It includes the intake, digestion, absorption, and utilization of food-a series of dynamic processes. The absorbed nutrients that are beneficial to the human body are called "nutrients," including six major categories: carbohydrates, lipids, proteins, vitamins, minerals, and water. Although dietary fiber cannot be absorbed and utilized by the human body, it is of great importance to human health and is an essential component of the diet. Human food is diverse, and the types and amounts of nutrients contained in various foods differ. Except for breast milk, no single natural food can provide all the nutrients the human body needs. Therefore, the human body must consume a variety of foods in a certain proportion to meet its needs. This is what is known as a "balanced diet." Daily food includes the following five categories: 1. Grains and tubers mainly provide carbohydrates, protein, fiber, and B vitamins. 2. Animal foods mainly provide protein, fat, minerals, vitamin A, and vitamin B. 3. Legumes and their products mainly provide protein, fat, fiber, minerals, and B vitamins. 4. Vegetables and fruits mainly provide fiber, minerals, vitamin C, and carotene. 5. Energy foods include animal fats, vegetable oils, starches, sugars, and alcoholic beverages, mainly providing energy. Vegetable oils also provide essential fatty acids and vitamin E. Dietary structure refers to the composition of food in a diet. A reasonable dietary structure is the foundation of a balanced diet and proper nutrition, and is of great significance for maintaining health and preventing disease. Based on the proportion of animal/plant-based foods in the diet and the different intakes of energy, protein, fat, and carbohydrates, the dietary structures of various countries in the world today can be roughly divided into three types: One is the "high-energy, high-fat, high-protein, and low-fiber" dietary pattern, represented by developed countries in Europe and America. This pattern involves an average annual consumption of approximately 100 kg of meat, 100-150 kg of milk and dairy products, 15 kg of eggs, and only 60-70 kg of grains per person. Although nutritionally rich, it suffers from an imbalance of the three major nutrients, with energy intake far exceeding energy expenditure, leading to increased incidences of obesity, hyperlipidemia, cardiovascular and cerebrovascular diseases, diabetes, breast cancer, and colorectal cancer. The other type is represented by most developing countries in Asia and Africa. Its characteristic is that the vast majority of nutrients come from plant-based foods, and energy intake generally meets the body's needs. Animal-based foods account for a low proportion and quantity, and the amounts of protein and fat are also low. In many countries, nutritional deficiencies remain a very serious social problem. The third type, represented by Japan, can be considered a transitional type between the first two. Its dietary structure features a relatively balanced ratio of animal and plant-based foods, and the intake of energy, protein, and fat generally meets the body's nutritional needs, representing a relatively reasonable dietary pattern. Dietary structure is closely related to socioeconomic status, production levels, and eating habits. In my country, with the improvement of economic levels, people's lives have undergone significant changes, and dietary structures have changed accordingly, especially in large cities. Grain consumption is declining, while the proportion of animal-based foods continues to increase, leading to improvements in both the quality and quantity of protein intake. Due to differences in region, economy, resources, access to scientific knowledge, and individual and family circumstances, nutritional status varies. Recent surveys show that Chinese residents face both malnutrition and overnutrition. Based on nutritional principles and the dietary habits of the Chinese people, Chinese nutritionists have formulated the "Dietary Guidelines for Chinese Residents" to guide residents in adopting a balanced diet and obtaining adequate nutrition to promote health.