Effects of FODMAPs (Fermentable Oligo-, Di-, and Mono-saccharides, And Polyols) on Small Bowel Water Content: an MRI Study
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 17
- 试验地点
- 2
- 主要终点
- small bowel water content area under the curve
研究概览
简要总结
Some carbohydrates, particularly fructose, the sugar found in fruit and bread may cause bloating, pain and erratic bowel habits (diarrhoea and constipation) particularly in patients suffering from the irritable bowel syndrome (IBS). This may be because they are not well absorbed in the small intestine and cause water to be trapped in the bowel causing distension. Studies have shown that reducing the amount of these sugars in the diet can relieve these symptoms. There is some evidence that combining fructose and glucose can reduce the symptoms caused by fructose but just why is unclear. In this study, the investigators will use a non invasive medical imaging technique called "magnetic resonance imaging" (or MRI) to look at the behaviour of drinks containing these sugars in the bowels of healthy human volunteers.
The investigators will give four different drinks: one beverage consisting of a very well absorbed sugar, glucose, another consisting of the less well absorbed sugar fructose, a third which is a mixture of glucose and fructose, and a fourth consisting of several fructose subunits joined together (called fructan). The investigators will take MRI images of the stomach and intestines at intervals for 5 hours and compare these with the feelings of distension and bloating in our volunteers. The results will act as control for subsequent studies in IBS patients and these may help design diets to reduce symptoms in IBS.
详细描述
Title: Effects of FODMAPs (Fermentable Oligo-, Di-, and Mono-saccharides, And Polyols) on small bowel water content: an MRI study
- Background. FODMAPs consist of fructose, lactose, fructo- and galacto-oligosaccharides such as fructans and galactans, and polyols such as sorbitol and mannitol. These carbohydrates are poorly absorbed in the small intestine and have been shown to trigger symptoms of irritable bowel syndrome (IBS). Previous studies have shown that fructose malabsorption results in an increased osmotic load in the small bowel, which can have a laxative effect. Physical proof of this has only been obtained using an ileostomy model on patients. This study indicated increased small bowel water content (SBWC) but this has never been established in intact humans .). We have been using noninvasive magnetic resonance imaging (MRI) to provide novel insights on the fate of food materials within the gastro-intestinal tract (GIT) of humans for the last decade.
- Aims (to include hypothesis to be tested) This study aims to investigate whether fructose alone will increase SBWC compared to an equivalent mass of glucose, and if adding glucose to fructose will reduce its effect on the SBWC. The study also aims to determine if fructans alter colonic transit.The main hypothesis is that fructose will increase small bowel water while fructans will mainly affect colonic transit..
- Experimental protocol and methods. A single-centre, randomized, cross-over design study consisting of a screening visit and four test days, which will be approximately 1 week apart The subjects (18 healthy volunteers for main study plus 4 for pilot studies) will receive (according to a randomization schedule) each test day one out of four test products: 1) glucose (control) 2) fructose, 3) glucose with fructose and 4) fructans. On each test day, volunteers will have a baseline scan in a 1.5T scanner, consume one of the products instead of breakfast at 09:00 and will be imaged in the scanner at intervals for 5 hours using a range of MRI sequences.
All the tested ingredients are food grade, have a history of safe use at intended usage levels, and are regarded as safe.
Four test products will be evaluated:
- 500 mL of glucose (40g of glucose dissolved in water with pure lime juice as flavorant)
- 500 mL fructose (40g fructose dissolved in water with pure lime juice as flavorant)
- 500 mL of glucose with fructose (40g glucose and 40g fructose dissolved in water with pure lime juice as flavorant, 40 or 80 gm)
- 500 mL fructan (40g of 100% fructan (inulin) dissolved in water with pure lime juice as flavorant)
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Single (Participant)
入排标准
- 年龄范围
- 18 Years 至 60 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Apparently healthy: no medical conditions which might effect study measurements.
- •No reported participation in another nutritional or biomedical trial 3 months before the pre-study examination or during the study.
- •Age ≥ 18 and ≤ 60 year at pre-study investigation.
- •Body mass index (BMI) ≥ 18.0 and ≤ 30.0 kg/m2
- •No reported participation in night shift work two days prior to pre-study investigation or during the study. Night work is defined as working between midnight and 6.00 AM.
- •Strenuous exercise ≤ 10 hours per week.
- •Gender: male or female
- •Consumption of ≤ 21 alcoholic drinks in a typical week
- •Currently not smoking
- •Suitable for MRI scanning (e.g., absence of metal implants, infusion pumps and pacemakers) as assessed by the attached MRI safety questionnaire.
排除标准
- •- use of medication which interferes with study measurements or bowel motility (as judged by the study physician).
- •Antibiotics in the 3 weeks before pre-study examination
- •Probiotics or during the study
结局指标
主要结局
small bowel water content area under the curve
时间窗: -45 min to 315 min
Area Under the curve for small bowel water content, methods as Marciani, L., et al., Gastroenterology, 2010. 138(2): p. 469-U90. Hoad, C.L., et al.,. Physics in Medicine and Biology, 2007. 52(23): p. 6909-6922.
次要结局
- gastric emptying T50(-45 min to 315 min)
- ascending colon volume(-45 min to 315 min)
- ascending colon motility(-45 min to 315 min)
- symptoms questionnaires(-45 min to 315 min)
- bowel transit time(24 hours)
- fecal tryptase activity(24 h)