Condition category
Digestive System
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status
Results overdue

Plain English Summary

Background and study aims
The company Sensus BV produces the food ingredient inulin, a type of soluble vegetable fibre extracted from chicory roots. Unsatisfactory bowel function occurs in many healthy adults, in particular among older people. However, while medical treatments (laxatives) developed for treatment of clinical constipation are effective against unsatisfactory bowel function, these treatments also have serious drawbacks. In particular it can be difficult to re-establish normal bowel function after long term use of laxatives. There is therefore a need to develop food-based strategies for safe self-management of unsatisfactory bowel function. It is known that consumption of fibre-rich vegetables tends to enhances and stabilises bowel function, possibly by providing good substrates for beneficial types of gut bacteria, but there are only few studies specifically investigating inulin.
The aim of the study is to measure the effect of inulin consumption on the stool frequency and stool consistency in healthy adults with unsatisfactory bowel function.

What does the study involve?
The study consists of two study periods each of 5 weeks, with at least two weeks between the periods. Participants will receive either the active inulin product (in the form of a sachet which is mixed with juice or another cold drink) or a placebo product (a ‘dummy product’ with similar taste and appearance, but no fibre content) to take twice a day for 5 weeks. After a break of at least 2 weeks, they will then have another 5 weeks of taking the other product (either the inulin or the placebo). This means that all participants will have the chance to try the active product during one of the two study periods they take part in.

Who can take part?
For this study we are looking for 22 men and women, between the age of 50 - 75 who are generally healthy, but have low stool frequency (2 days or more per week without successful bowel movements) and do not take any medication for it. Participants will be required to attend visits at Newcastle University.

When does the study take place?
The study period is from to 8th December 2011 to 20th June 2012.

Where does the study take place?
The study takes place at Newcastle University, in Newcastle upon Tyne, United Kingdom.

What are the benefits and risks to participants?
The benefit to participants is that if the product works, their well-being will benefit during the treatment period. Since the study product is a widely used food ingredient and several common foods can provide doses corresponding to those used in the study, any participant who feels that their bowel function has improved during (part of) the trial will be able to choose to continue treatment after the completion of the study and achieve the corresponding benefits (whether or not the perceived benefits are caused by the product itself or are a placebo effect).
The following potential risks were identified: 1. Possible minor side effects (flatulence, stomach rumbling) when consuming the study product; 2. Possible health risk if the study product gets wet and subsequently becomes mouldy; 3. Possible embarrassment when transporting stool samples, e.g. on public transport. Appropriate management procedures have been implemented to control each of these risks.

Who is funding the project?
The study will be financed by Sensus BV, Rosendaal, the Netherlands.

Who is the main contact?
Miss Carolyn Taylor, trials assistant.
Telephone: 0191 222 3592 or 07583252204

Trial website

Contact information



Primary contact

Dr Kirsten Brandt


Contact details

Human Nutrition Research Centre
Agriculture Building
Newcastle University
Newcastle upon Tyne
United Kingdom
+44 191 222 5852

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

Effects of Inulin versus placebo on bowel function in older people with a low Frequency of defecation



Study hypothesis

The principal question of this study is to quantify the effect of native inulin on the stool frequency and stool consistency in slightly constipated older people using validated questionnaires.

Ethics approval

Newcastle University Sage Faculty Ethics Committee, reference number BH102085, 01/12/2011

Study design

Randomised double-blind placebo-controlled cross-over study

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Patient information sheet can be found at


Bowel function (unsatisfactory stool frequency)


Intervention: Inulin from chicory roots, 10g daily orally
Placebo: Maltodextrin, 10g daily orally

5 weeks treatment followed by 2 weeks washout then 5 weeks treatment.

Intervention type



Not Applicable

Drug names

Primary outcome measure

Stool frequency measured by diary, kept daily during weeks 1, 3 and 5 of each intervention period

Secondary outcome measures

1. Self-reported stool consistency measured using the Bristol scale
2. Patient assessment of constipation (PAC-SYM) questionnaire

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Healthy volunteers
2. Men and women aged between 50 and 75 years
3. Low stool frequency (2 days or more per week without successful bowel movements)

Participant type

Healthy volunteer

Age group




Target number of participants


Participant exclusion criteria

1. Clinical constipation as defined by the Rome criteria
2. Anatomical cause of reduced bowel function
3. History of colonic or anal surgery
4. Current or recent (<5 years) diagnosis of cancer, coronary heart disease or diabetes
5. Inflammatory bowel diseases (Crohn’s disease, ulcerative colitis)
6. Use of antibiotics, laxatives or diuretics in the last 3 months
7. Current or recent (<3 months) use of opium preparations
8. Any other condition that in the view of the participant’s GP may make the participant unsuitable for the trial

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

Human Nutrition Research Centre
Newcastle upon Tyne
United Kingdom

Sponsor information


Newcastle University (UK)

Sponsor details

Human Nutrition Research Centre
School of Agriculture
Food and Rural Development
Newcastle upon Tyne
United Kingdom

Sponsor type




Funder type


Funder name

Sensus BV (Netherlands)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

To be confirmed at a later date

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

13/02/2018: No publications found in PubMed, verifying study status with principal investigator. 30/11/2015: No publications found in PubMed.