Dietary Guidelines for Americans 美国饮食指导www.shengfang.org
Although early versions of food-group systems provided practical guidelines for avoiding nutrient deficiencies, they did not directly address the prevention of other diet-related health problems. To deal with this matter, the U.S. Department of Agriculture and the U.S. Department of Health and Human Services have published Dietary Guidelines for Americans to help individuals meet nutrient requirements, promote health, support active lives, and reduce chronic disease risks. The current (1995) report notes that eating is one of life's great pleasures, but that diet is important to health at all stages of life. The Dietary Guidelines apply to food intake over several days and not to single meals or foods. They are:

尽管早期的食品组织已经为了避免营养不良而提供了实际可行的指导方针，但是这些还不能直接预防其他和食品相关的健康问题。为了处理这些问题，美国农业部门、美国健康和公共事业部门发布了美国饮食指导，以帮助那些有如下需求的人：营养需求、促进健康、积极生活、降低慢性病风险，1995年报告指出：吃是生活中最重要的事情。通常所吃的食物在人的整个生命周期中对健康有重大影响。饮食指导方针应用于一段时间之类的食物摄入量，而不是仅对于个别的食物或膳食。www.shengfang.org

1. Eat a variety of foods. No single food can supply all the nutrients in needed amounts. To ensure variety and a well-balanced diet, choose foods each day from the five major food groups displayed in the Food Guide Pyramid: vegetables (3-5 servings); fruits (2-4 servings); breads, cereals, rice, and pasta (6-11 servings); milk, yogurt, and cheese (2-3 servings); and meat, poultry, fish, dry beans, eggs, and nuts (2-3 servings). Since foods within each group vary somewhat in nutrient content, it is best to vary one's choices within each group. Vitamin or mineral supplements at or below the RDA are safe but rarely needed by people who eat an appropriate variety of foods. Supplements may be appropriate for certain people, but they are not a substitute for proper food choices.

吃的食物要多样化。没有一种食物能够提供一个人所必须的所有营养。为了保证多样性和营养均衡性，每天应该从食物指南金字塔中的五种主要食品类别挑选食物：蔬菜；水果；面包、谷类、米饭、以及面食；牛奶、酸奶酪、干酪；肉类、家禽、鱼、干豆、蛋；坚果。由于每种食物类别含有不同的营养成份，所以最好每种食物类别交叉搭配。维生素和矿物质补充量在符合日推荐摄食量或者以下都是安全的，很少有平时饮食合理搭配适度变化的人需要补充。补充只是适应于某些人，但是绝对不能替换正确的食物选择。www.shengfang.org