Estimation of conjugated linoleic acid intake by written dietary assessment methodologies underestimates actual intake evaluated by food duplicate methodology
Estimation of conjugated linoleic acid intake by written dietary assessment methodologies underestimates actual intake evaluated by food duplicate methodology
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DOI：
10.1093/jn/131.5.1548
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发表时间：
2001-05-01
影响因子：
4.2
通讯作者：
McGuire, MA
中科院分区：
文献类型：
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作者：
Ritzenthaler, KL;McGuire, MK;McGuire, MA
共轭亚油酸 (CLA) 是亚油酸的共轭异构体，可促进癌症、心脏病、糖尿病、骨形成、生长调节和免疫方面的健康。 CLA 的 c9,t11 异构体瘤胃酸 (RA) 是饮食中存在的主要异构体。然而，人类对 CLA 和 RA 的膳食摄入量尚未经过严格检验，膳食 CLA 或 RA 与健康（例如身体成分）之间的关系也尚未经过严格检验。从成年男性 (n = 46) 和女性 (n = 47) 收集三天饮食记录 (DR)，并使用经过修改以包含总 CLA 和 RA 的营养数据库进行分析。同时，收集 3 d 食物重复 (FD)，以分析确定个体脂肪酸摄入量，包括总 CLA 和 RA 的摄入量。使用半定量食物频率问卷（FFQ）估算慢性总 CLA 和 RA 摄入量。使用体重指数和身体脂肪百分比来估计身体成分。根据 FD 估计，男性和女性的 CLA 总摄入量分别为 212 +/- 14 和 151 +/- 14 毫克/天（平均值 +/- SEM）；男性和女性的 RA 摄入量估计分别为 193 +/- 13 和 140 +/- 14 毫克/天。一般来说，DR 和 FFQ 估计的 CLA 和 RA 摄入量显着低于 FD 估计的摄入量。身体成分与膳食总 CLA 或 RA 摄入量没有显着相关。总之，结果表明 DR 和 FFQ 方法并不是个体 CLA 和 RA 总摄入量的可靠估计，并且可能会低估群体的 CLA 和 RA 总摄入量。总 CLA 和 RA 的摄入量被发现明显低于其他人之前建议的摄入量。
Conjugated linoleic acids (CLA) are conjugated isomers of linoleic acid, which may promote health with regard to cancer, heart disease, diabetes, bone formation, growth modulation and immunity. The c9,t11 isomer of CLA, rumenic acid (RA), is the major isomer present in the diet. However, dietary intakes of CLA and RA by humans have not been examined rigorously, nor has the relationship between dietary CLA or RA and health (e.g., body composition). Three-day dietary records (DR) were collected from adult men (n = 46) and women (n = 47) and analyzed using a nutrient database modified to contain total CLA and RA. Simultaneously, 3-d food duplicates (FD) were collected to determine analytically individual fatty acid intakes, including those of total CLA and RA. Chronic total CLA and RA intakes were estimated using a semiquantitative food-frequency questionnaire (FFQ). Body composition was estimated using body mass index and percentage of body fat. Total CLA intake was estimated from FD to be 212 +/- 14 and 151 +/- 14 mg/d (mean +/- SEM) for men and women, respectively; RA intake was estimated to be 193 +/- 13 and 140 +/- 14 mg/d for men and women, respectively. In general, CLA and RA intakes estimated by DR and FFQ were significantly lower than those estimated by FD. Body composition was not significantly related to dietary total CLA or RA intake. In conclusion, results suggest that DR and FFQ methodologies are not reliable estimators of individual total CLA and RA intakes and may underestimate total CLA and RA intakes of groups. Intake of total CLA and RA was found to be significantly lower than that suggested previously by others.