From 2008, the UK’s National Diet and Nutrition Survey (NDNS) changed the method of dietary data collection from a 7-d weighed diary to a 4-d unweighed diary, partly to reduce participant burden. This study aimed to test whether self-reported energy intake changed significantly over the 4-d recording period of the NDNS rolling programme. Analyses used data from the NDNS years 1 (2008/2009) to 8 (2015/2016) inclusive, from participants aged 13 years and older. Dietary records from participants who reported unusual amounts of food and drink consumed on one or more days were excluded, leaving 6932 participants. Mean daily energy intake was 7107 kJ (1698 kcal), and there was a significant decrease of 164 kJ (39 kcal) between days 1 and 4 (P < 0·001). There was no significant interaction of sex or low-energy reporter status (estimated from the ratio of reported energy intake:BMR) with the change in reported energy intake. The decrease in reported energy intake on day 4 compared with day 1 was greater (P < 0·019) for adults with higher BMI (>30 kg/m2) than it was for leaner adults. Reported energy intake decreased over the 4-d recording period of the NDNS rolling programme suggesting that participants change their diet more, or report less completely, with successive days of recording their diet. The size of the effect was relatively minor, however.

中文翻译：

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在全国饮食和营养调查中，自我报告的食物摄入量在记录期内减少

从 2008 年开始，英国的全国饮食和营养调查 (NDNS) 将饮食数据收集方法从 7 天称重日记改为 4 天不称重日记，部分是为了减轻参与者的负担。本研究旨在测试自我报告的能量摄入是否在 NDNS 滚动计划的 4 天记录期间发生显着变化。分析使用了来自 13 岁及以上参与者的 NDNS 第 1 年（2008/2009）至第 8 年（2015/2016）的数据。排除了报告在一天或多天消耗的食物和饮料量异常的参与者的饮食记录，剩下 6932 名参与者。平均每日能量摄入量为 7107 kJ（1698 kcal），在第 1 天和第 4 天之间显着减少了 164 kJ（39 kcal）（磷< 0·001)。性别或低能量报告状态（根据报告的能量摄入：BMR 的比率估计）与报告的能量摄入的变化没有显着的相互作用。与第 1 天相比，第 4 天报告的能量摄入量减少幅度更大（磷< 0·019) 对于 BMI 较高 (>30 kg/m2) 的成年人2) 比对于较瘦的成年人而言。报告的能量摄入量在 NDNS 滚动计划的 4 天记录期间有所减少，这表明参与者在连续几天记录他们的饮食时会更多地改变他们的饮食，或者报告得更少。然而，影响的大小相对较小。