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前言一个人群或社团的营养状况可通过膳食调查、临床和生化检查三方面加以评价。在既往15年中,美国曾做了大量的营养调查,其中大规模的全国性调查有三、四次。两次始于六十年代末,终于七十年代初。另一次则是在1971～1974年间进行的,与该次研究相接应的调查目前正在进行之中。本文限于篇辐,仅对上述三次全国调查的主要结果进行小结并作简洁的讨论。最后通过与1975年以来所进行的小型调查资料相比较,以观察营养状况可能发生的改变。
Preface The nutritional status of a group or community can be assessed through dietary surveys, clinical and biochemical tests. In the past 15 years, the United States has conducted a large number of nutrition surveys, of which large-scale nationwide surveys have been conducted three or four times. Twice began in the late 1960s and finally in the early 1970s. The other one was conducted between 1971 and 1974, and the survey that corresponds to the current study is currently under way. This article is limited to articles spoke only summary of the main results of the three national surveys described above and for a concise discussion. Finally, we compared the data from the small-scale survey conducted since 1975 to observe possible changes in nutritional status.