Background and Aims

Pre-colonoscopy dietary restrictions vary widely and lack evidence-based guidance. We investigated whether fiber and various other foods/macronutrients consumed during the 3 days before colonoscopy are associated with bowel preparation quality.

Methods

This was a prospective observational study among patients scheduled for outpatient colonoscopy. Patients received instructions including split-dose polyethylene glycol, avoidance of vegetables/beans 2 days before colonoscopy, and a clear liquid diet the day before colonoscopy. Two 24-hour dietary recall interviews and 1 patient-recorded food log measured dietary intake on the 3 days before colonoscopy. The Nutrition Data System for Research was used to estimate dietary exposures. Our primary outcome was the quality of bowel preparation measured by the Boston Bowel Preparation Scale (BBPS).

Results

We enrolled 201 patients from November 2015 to September 2016 with complete data for 168. The mean age was 59 years (standard deviation, 7 years), and 90% of colonoscopies were conducted for screening/surveillance. Only 17% and 77% of patients complied with diet restrictions 2 and 1 day(s) before colonoscopy, respectively. We found no association between foods consumed 2 and 3 days before colonoscopy and BBPS scores. However, BPPS was positively associated with intake of gelatin, and inversely associated with intake of red meat, poultry, and vegetables on the day before colonoscopy.

Conclusions

Our findings support recent guidelines encouraging unrestricted diets >1 day before colonoscopy if using a split-dose bowel regimen. Furthermore, we found no evidence to restrict dietary fiber 1 day before colonoscopy. We also found evidence to promote consumption of gelatin and avoidance of red meat, poultry, and vegetables 1 day before colonoscopy.

中文翻译：

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结肠镜检查中饮食，膳食纤维和肠道准备之间的关系

背景和目标

结肠镜检查前的饮食限制千差万别，缺乏循证指南。我们调查了结肠镜检查前3天内消耗的纤维和其他各种食物/宏营养素是否与肠道准备质量有关。

方法

这是对计划进行门诊结肠镜检查的患者进行的一项前瞻性观察性研究。患者接受的指示包括分剂量的聚乙二醇，结肠镜检查前2天避免食用蔬菜/豆类以及结肠镜检查前一天的清淡饮食。在结肠镜检查前3天，进行了两次24小时饮食召回访谈和1例患者记录的食物记录，以测量饮食摄入量。营养研究数据系统用于估计饮食摄入量。我们的主要结果是通过波士顿肠道准备量表（BBPS）衡量的肠道准备质量。

结果

我们收集了2015年11月至2016年9月期间的168例患者的168例完整数据。平均年龄为59岁（标准差为7岁），并进行了90％的结肠镜检查以进行筛查/监测。分别在结肠镜检查前2天和1天遵守饮食限制的患者分别为17％和77％。我们发现结肠镜检查前2天和3天食用的食物与BBPS评分之间没有关联。然而，在结肠镜检查前一天，BPPS与明胶的摄入呈正相关，与红肉，家禽和蔬菜的摄入呈负相关。

结论

我们的发现支持最近的指南，如果使用分剂量肠方案​​，则鼓励在结肠镜检查前> 1天进行无限制饮食。此外，我们没有发现在结肠镜检查前1天限制饮食纤维的证据。我们还发现有证据表明在结肠镜检查前1天可以促进明胶的摄入并避免食用红肉，家禽和蔬菜。