Biogut: a study of nutrient bioaccessibility in ileostomy volunteers
| ISRCTN | ISRCTN40517475 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN40517475 |
| Secondary identifying numbers | N/A |
- Submission date
- 31/05/2012
- Registration date
- 13/06/2012
- Last edited
- 04/09/2015
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Digestive System
Plain English summary of protocol
Background and study aims
Evidence shows that the structure and properties of plant foods, particularly of the cell wall component (dietary fibre), play an important role in regulating the release (bioaccessibility) of nutrients from plant foods during chewing and digestion. Cell walls may act as a physical barrier to the digestion of carbohydrate and/or fat thus attenuating the blood glucose or lipid response induced. In a meal, fat and/or starch availability can therefore be controlled by modifying the amount of the nutrients encapsulated by cell walls. Because glucose and lipid responses following the consumption of a meal are associated with reduced risk factors for type 2 diabetes mellitus and cardiovascular disease, this work has implications for the prevention and management of these diseases. The aim of this project is to investigate the effect of meals with various degree of bioaccessibility (amount of cell walls) on nutrient (lipid/starch) release in a group of ileostomy volunteers (removing the colon is called proctocolectomy and creating the opening to the intestine is called ileostomy).
Who can participate?
We are looking for 12 ileostomy volunteers, who are not allergic to almonds or any other ingredients incorporated in any of the test meals. To be eligible, you must be aged 20-60 years, previously had proctocolectomy, be stable for at least 12 months since you had your ileostomy, and have eaten almonds with no adverse effects.
What does the study involve?
Once we have checked your eligibility and you have given consent, we will ask you to attend a screening session and five study visits at the Clinical Research Facility of St Thomas' Hospital. The study visits are divided into two studies: Study 1 looking at fat release and Study 2 looking at starch release.
During the session (lasting between 13 and 14 hours) you will be given for breakfast either:
Study 1 (3 visits): 85 g of whole almonds given with a muffin and some custard, a muffin containing almond flour with some custard, or a muffin containing 2 mm almond pieces and some custard.
Study 2 (2 visits): porridge containing durum wheat flour and 300 ml water, or porridge containing 2 mm durum wheat large semolina and 300 ml water. Digestive products leaving the ileum (effluents) will be collected every 2 h up to 12 h and at your convenience in the evening and overnight. Blood will also be collected (approximately 15 ml = 3 teaspoons) after the meals at different time intervals up to 8 hours for Study 1 and 4 hours for Study 2. The effluent samples produced will be used for nutrient analysis (lipid or starch), microscopy and particle sizing. Glucose and lipid levels will be measure in the collected blood samples.
What are the possible benefits and risks of participating?
Full biochemical, anthropometric and blood pressure screening will be available to all participants at the screening stage. Results will be available to all participants. We believe the risks to participants are minimal as the study involves everyday activities. Our main concern is that individuals who are allergic to nuts and have experienced obstruction of the stoma do not take part.
Where is the study run from?
The study is organised by researchers from King's College London and will take place at the Clinical Research Facility of St Thomas' Hospital, Westminster Bridge Road, London SE1 7EH.
When is the study starting and how long is it expected to run for?
It is anticipated that recruitment will start August/September 2012. Participants will be enrolled on the study for a period of 5/6 months.
Who is funding the study?
The Biotechnology and Biological Sciences Research Council (BBSRC), reference BB/H004866/1.
Who is the main contact?
Myriam Grundy, myriam.grundy@kcl.ac.uk
Cathrina Edwards, cathrina.edwards@kcl.ac.uk
Contact information
Scientific
4th Floor, Franklin Wilkins Building
Waterloo Campus
King's College London
150 Stamford Street
London
SE1 9NH
United Kingdom
Study information
| Study design | Randomised cross-over design trial |
|---|---|
| Primary study design | Interventional |
| Secondary study design | Randomised cross over trial |
| Study setting(s) | Hospital |
| Study type | Other |
| Participant information sheet | Not available in web format, please use the contact details below to request a patient information sheet |
| Scientific title | A randomised trial to study nutrient bioaccessibility in ileostomy volunteers |
| Study acronym | Biogut |
| Study objectives | Changing the structure/degree of processing of food ingredients will alter the amount of nutrients that is released (nutrient availability) when that food is eaten. Meals with a lower nutrient availability will generate a slower/smaller blood glucose or lipid response than the meals with a higher nutrient availability. |
| Ethics approval(s) | REC name: South East Coast - Kent, 27/06/2012, ref: 12/LO/1016 |
| Health condition(s) or problem(s) studied | Digestion and nutrient bioaccessibility |
| Intervention | Participants will eat on 5 separate occasions the test meals rich in either fat (Study 1) or starch (Study 2): Study 1 (3 visits) 1. 85 g of whole almonds given with a muffin and some custard 2. A muffin containing almond flour and almond oil with some custard 3. A muffin containing 2 mm almond pieces and some custard Study 2 (2 visits) 1. Porridge containing durum wheat flour and 300 ml water 2. Porridge containing 2 mm durum wheat large semolina and 300 ml water |
| Intervention type | Other |
| Primary outcome measure | Indicative measure of the digestibility (nutrient loss and modification in cell wall structure) of fat or starch foods during passage throught the upper gastrointestinal tract |
| Secondary outcome measures | 1. Measuring the glycaemic and lipaemic response to the test meals including insulin and c-peptide 2. Measuring the particle size of chewed and digested samples 3. Examination of the microstructure of chewed and digested samples 4. Measuring gut hormones [peptide YY (PYY), cholecystokinin (CCK), glucagon-like peptide-1 (GLP-1) and gastric inhibitory polypeptide (GIP)] For Study 1, plasma triacylglycerol concentrations will be measured hourly up to 8 h to determine the overall level of lipaemia after eating the test meal. Plasma glucose and insulin will also be measured at 0, 15, 30, 45, 60, 90, and 120 min and thereafter at 3, 4, 5, 6, 7, and 8 h. For Study 1 and 2, plasma glucose and insulin concentrations will be measured at 0, 15, 30, 45, 60, 90, 120, 150 min and at hourly intervals up to 4 h, to determine blood glucose and insulin levels after eating the test meal. |
| Overall study start date | 03/09/2012 |
| Completion date | 08/02/2013 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Adult |
| Sex | Both |
| Target number of participants | 12 |
| Key inclusion criteria | 1. Male or female aged 20-60 years, who previously had proctocolectomy 2. Stable at least 12 months post-operative 3. Normal stoma functions (digest and excrete food without any difficulty) |
| Key exclusion criteria | 1. Allergy to almonds or related products, gluten and any other added ingredients in recipe of the test meal 2. Previous case of obstruction of the stoma 3. Body mass index < 20 kg/m2 or > 35 kg/m2 4. Have a diagnosed mouth, throat or gastrointestinal tract problem (other than ileostomy) that may affect normal ingestion and digestion of food 5. Plasma glucose > 7 mmol/L 6. Plasma cholesterol > 7.8 mmol/L 7. Plasma triacylglycerol > 3 mmol/L 8. On a medication regimen that would invalidate the results as judged by the medical advisor |
| Date of first enrolment | 03/09/2012 |
| Date of final enrolment | 08/02/2013 |
Locations
Countries of recruitment
- England
- United Kingdom
Study participating centre
London
SE1 7EH
United Kingdom
Sponsor information
Hospital/treatment centre
c/o Mr Keith Brennan
Room 1.8
Hodgkin Building
Guy's Campus
London
SE1 4UL
England
United Kingdom
"ROR" |
https://ror.org/0220mzb33 |
|---|
Funders
Funder type
Research council
Government organisation / National government
- Alternative name(s)
- UKRI - Biotechnology And Biological Sciences Research Council, BBSRC UK, BBSRC
- Location
- United Kingdom
Results and Publications
| Intention to publish date | |
|---|---|
| Individual participant data (IPD) Intention to share | No |
| IPD sharing plan summary | Not provided at time of registration |
| Publication and dissemination plan | Not provided at time of registration |
| IPD sharing plan |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | results | 01/10/2015 | Yes | No |
