Crane N T, Lewis C J, Yetley E A
Food and Drug Administration, Division of Nutrition (HFF-265), Washington, DC 20204.
Am J Public Health. 1992 Jun;82(6):862-6. doi: 10.2105/ajph.82.6.862.
Two types of data may be used to estimate trends in food and nutrient intake by the US population: per capita food supply estimates and survey estimates of individual intake. Because these data vary markedly in measurement goals and methods, we examined whether trends in food supply and survey intake estimates for fat, carbohydrate, and protein are reflective of one another.
The data selected for comparison included all available survey estimates of mean intake by the US population (i.e., periodic estimates from 1965 to 1988) and all available per capita food supply estimates from a comparable time period (i.e., annual estimates from 1965 to 1985).
The two types of data generally did not reflect the same trends. Furthermore, expressing macronutrient levels as percentage of calories rather than in grams affected the trend relationships.
Our findings indicate that caution is needed in the selection and application of available data to estimate trends in macronutrient intake by the US population and in the interpretation of these data with regard to public health research, policies, and programs.
有两类数据可用于估计美国人群食物和营养素摄入量的趋势：人均食物供应估计值和个体摄入量的调查估计值。由于这些数据在测量目标和方法上存在显著差异，我们研究了脂肪、碳水化合物和蛋白质的食物供应趋势与调查摄入量估计值是否相互反映。
选择用于比较的数据包括美国人群平均摄入量的所有可用调查估计值（即1965年至1988年的定期估计值）以及同一时期的所有可用人均食物供应估计值（即1965年至1985年的年度估计值）。
这两类数据通常并未反映出相同的趋势。此外，将宏量营养素水平表示为热量的百分比而非克数会影响趋势关系。
我们的研究结果表明，在选择和应用现有数据来估计美国人群宏量营养素摄入量趋势以及在公共卫生研究、政策和项目中对这些数据进行解释时需要谨慎。
