膳食指南要随时代变化，但不能像美国这样变

Core Viewpoint - The latest U.S. Dietary Guidelines for 2025-2030 have been described as the most significant change in federal nutrition policy history, emphasizing that dietary recommendations should evolve with societal changes and health needs [1][6]. Summary by Sections Overview of the New Guidelines - The new guidelines are characterized by contradictions, with some recommendations aligning with previous versions, such as limiting saturated fat intake to no more than 10% of total daily calories and encouraging the consumption of whole grains while reducing refined carbohydrates [3][6]. - Notably, the guidelines have controversially reversed the previous food pyramid, placing red meat and full-fat dairy at the top and suggesting prioritizing protein intake at each meal, which contradicts the guideline's own recommendations on saturated fat [3][6]. Historical Context - This is the 10th edition of the U.S. Dietary Guidelines, first published in 1980 and updated every five years, serving as a global benchmark for dietary recommendations [6]. - The evolution of these guidelines reflects changes in national history and public health, transitioning from addressing nutritional deficiencies to focusing on chronic disease prevention [6][8]. Key Changes and Controversies - The guidelines have sparked significant debate within the scientific community, with some experts expressing concerns over the potential health risks associated with the new recommendations, particularly regarding increased meat and dairy consumption [2][3]. - Other contradictory suggestions include varying recommendations for protein, dairy, and grain intake, as well as guidelines on processed foods and alcohol consumption [3][6]. Comparison with Other Countries - Similar to the U.S., other countries, including China, have adapted their dietary guidelines over time to reflect current nutritional needs and health trends, emphasizing the importance of a balanced diet [5][15][20].