Application of a new simple method for estimating the amount of protein,fat, and carbohydrate in cooked foods consumed in one day

摘要

To obtain accurate estimates of daily nutrient intake, duplicate food samples should be analyzed chemically. Traditional methods of chemical analysis, however, are impracticable for surveys of numerous samples. This paper describes a new, rapid, and simple method of estimating dietary intake that utilizes a high speed and high performance carbon, hydrogen, and nitrogen autoanalyzer. In the present study, the applicability of the proposed method to surveys in the field was examined using duplicate samples consumed in one day. Protein weights were identical, because nitrogen values obtained by the autoanalyzer were used to calculate protein amounts in food samples. Fat weights estimated by the new method correlated significantly (n = 50; r = 0.979; y = 0.941x - 0.43; p < 0.001) with those measured by Soxhlet's ether-extraction method, and good measuring agreement was observed. Carbohydrate amounts and energy levels estimated by the proposed method also correlated significantly to the analytical values, and good measuring agreements were observed. These results suggest that this new method is applicable to field surveys, especially to the study of mixed and cooked foods where agreement has been lowered by misidentifications of foodstuffs and interference by the culinary process. <(c)> 2001 Elsevier Science Inc. All rights reserved.