Kim W W, Mertz W, Judd J T, Marshall M W, Kelsay J L, Prather E S
Am J Clin Nutr. 1984 Dec;40(6 Suppl):1333-7. doi: 10.1093/ajcn/40.6.1333.
In a 1-yr study in which food intakes were recorded daily, subjects were asked to make duplicate food collections for 1 wk during each of the four seasons. Mean calculated energy intake of the 29 subjects was 12.9% less during the food collection periods than the mean for the entire year (which included collection periods). There were also significant reductions in the reported intake of all nutrients during the collection periods. Protein, vitamin A, saturated fat, and cholesterol intakes were decreased to the greatest extent. The actual decrease in energy intake was greater for the males than for the females, but the percentage was the same (12.9%). The younger group of subjects (less than or equal to 35) decreased energy intake 16.8% and the older group (greater than 35) 8.8%. Comparison of intakes during collection periods with intakes the week before and the week after showed that 28 of the 29 subjects decreased their energy intake from 1.1 to 32.3%. These data suggest that intakes of subjects during food collection periods do not represent their habitual levels of intake reported throughout the year.
在一项为期1年的研究中，每天记录食物摄入量，要求受试者在四个季节中的每个季节进行为期1周的食物双份采集。29名受试者在食物采集期间的平均计算能量摄入量比全年（包括采集期）的平均水平低12.9%。在采集期间，所有营养素的报告摄入量也有显著减少。蛋白质、维生素A、饱和脂肪和胆固醇的摄入量下降幅度最大。男性的能量摄入量实际下降幅度大于女性，但百分比相同（12.9%）。较年轻的受试者组（小于或等于35岁）能量摄入量下降了16.8%，较年长的组（大于35岁）下降了8.8%。将采集期间的摄入量与采集前一周和采集后一周的摄入量进行比较，发现29名受试者中有28名的能量摄入量下降了1.1%至32.3%。这些数据表明，受试者在食物采集期间的摄入量并不代表他们全年报告的习惯性摄入量水平。
