The concept of big food not only points out the direction for China's agricultural transformation and upgrading in the new era, but also has important significance in ensuring food security, promoting comprehensive rural revitalization, and even building a socialist modernized strong country. Ten thousand things are born when they have their roots, and a hundred things are achieved when they have their way. Food security is crucial to the current and long-term development of our country. Currently, with the rapid development of China's economy and continuous social progress, as well as the gradual implementation of the Healthy China strategy, the living standards of the people are constantly improving, and their nutritional needs are becoming increasingly diversified, comprehensive, and balanced. Food security is gradually shifting towards food security. The concept of big food has rich connotations, for example, the types of food that the masses eat not only include main grains such as rice, wheat, and corn, but also include side foods such as meat, eggs, milk, oil, fruits and vegetables, and aquatic products; Food sources include not only agriculture, but also animal husbandry and biotechnology; The food structure not only includes ordinary agricultural and sideline products, but also high-quality agricultural and sideline products that are green, organic, and pollution-free; The food category includes not only primary agricultural and sideline products, but also deeply processed agricultural and sideline products. In short, the big food concept should ensure the safety of both "rice bags" and "vegetable baskets", "fruit plates", "meat cases", "oil bottles", and "milk jars"; Not only pursue the quantity and variety of food, but also pay more attention to the quality and quality of food. The concept of big food has not only expanded the scope and safety boundaries of traditional food production, but also achieved a profound transformation of agricultural and sideline products from single production to diversified supply, indicating that China is undergoing a major transformation in developing modern agriculture, maintaining food diversity, and maintaining food supply and demand balance. The key to the concept of big food lies in achieving sustainable agricultural development and the harmonious development of ecology, agriculture, forestry, animal husbandry, and fisheries. The core lies in deepening the structural reform of the agricultural supply side and ensuring national food and food security. The essence is to meet the needs of the people for a better life, and improve their sense of gain, happiness, and security. In line with the development trend of the times and the wishes of the people, the concept of big food is a timely response to the changing trend of food structure, as well as a careful planning for a higher level of agricultural modernization. It has profound significance in guiding China's agriculture to achieve high-quality development in the new era. At present, the international political situation is complex and ever-changing, and the trend of anti globalization is becoming increasingly fierce. The complexity, severity, and challenge of China's economic development environment are constantly increasing. The uncertainty of the global food industry chain and supply chain is rapidly increasing, and the strategic position of food security is becoming increasingly prominent. Only by firmly establishing and practicing the concept of big food, adhering to the principle of storing grain in the land and technology, guarding the red line of 1.8 billion mu of arable land, accelerating the development of ethnic seed industry with independent intellectual property rights, further deepening the structural reform of agricultural supply side, making every effort to expand grain production capacity, and improving grain quality, can China truly play the role of a "ballast stone" in food security, and firmly hold the rice bowl in its own hands. The two people are the foundation of the country, and the valley is the destiny of the people. At present, there are many shortcomings in the production, supply, circulation, and supervision of food resources in China. The dietary structure of urban and rural residents is not entirely reasonable, especially the imbalance in the supply and demand structure of safe and high-quality food, and the weak effective supply capacity of green, organic, and pollution-free food. In this sense, the concept of big food not only reflects a scientific understanding of the growing needs of the people for a better life and the main contradiction of unbalanced and insufficient development in society, but also reflects an accurate grasp and advanced planning of enhancing the sense of gain, happiness, and security of the people. Only by consciously practicing the concept of big food, following the trend of changes in the food consumption structure of the people in the era of "big health", and gradually improving the dietary structure and nutritional supply of urban and rural residents while ensuring a rich variety and sufficient quantity of food, can we promote the transformation of food consumption among members of society from "eating full" to "eating well", "eating nutritious", and "eating healthier"; Only with the guidance and leadership of the concept of big food, can we build batches of rice granaries, meat and egg baskets, fish and shrimp baskets, and fruit and vegetable plates that urban and rural residents can trust, continuously meet the new needs of the people for diversified, refined, nutritious, and ecological food, and maximize the protection of "happiness on the people's dining table". In recent years, China has done a lot of work and achieved great results in developing modern agriculture, deepening the supply side structural reform of agriculture, developing and utilizing food resources, and ensuring food diversity. However, structural contradictions remain a long-term prominent problem that restricts China's food development, mainly manifested in insufficient resource endowment, unreasonable regional division of labor in food, low-end food structure, and slow green transformation. These unfavorable factors are also the main obstacles to practicing the concept of big food. The data provided by the Ministry of Agriculture and Rural Affairs shows that China has a population of over 1.4 billion, and needs to consume over 700000 tons of grain, 98000 tons of oil, 1.92 million tons of vegetables, and 230000 tons of meat every day. To meet such a huge consumption demand, it is necessary to adhere to the new development concept as the leadership, widely select ingredients, open up food sources, and open up food routes. Only by actively practicing the concept of big food in combination with reality, adhering to innovation as the driving force and guidance, and focusing on doing a good job in the major aspects of grain, food, and agriculture, can we achieve deep integration of the primary, secondary, and tertiary industries; Only by coordinating the comprehensive development of arable land, mountains, rivers, forests, lakes, grasslands, and sands, and expanding food sources in all aspects and ways, can food diversity be continuously increased; Only by adhering to ecological priority, fully considering environmental carrying capacity and making every effort to protect the ecological environment, and effectively ensuring the ecological safety of mountains, rivers, forests, fields, lakes, grasslands, and sands, can food production safety, supply safety, nutritional safety, and quality safety be maintained; Only by focusing on expanding opening up to the outside world and fully utilizing both domestic and international food resources and markets can we further expand the scope of food security; Only by proceeding from the diversified food needs of urban and rural residents, correctly grasping and scientifically handling the important relationships between "stock" and "increment", "quantity" and "quality", "production" and "ecology", "domestic" and "foreign", can we meet the increasingly diversified food consumption needs of the people and lay the foundation for food security and food security to comprehensively promote the great rejuvenation of the Chinese nation with Chinese path to modernization, by ensuring that food is suitable for food, economy, husbandry, fishing, and forestry, forming a reasonably structured and powerful food supply system, constantly increasing food quantity, improving food quality, and achieving a balance between food supply and demand.