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CompletedNCT02838849Updated Jul 20, 2016

Fiber and Water Improve Bowel Habit in Humans

A Phase 1/2 interventional study of Fiber and Fiber and Water in Dietary Habits and Bowel Dysfunction, sponsored by Universidade de Passo Fundo. Completed. Open to participants aged 19 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2016-07-20.

Sponsored by Universidade de Passo Fundo · Phase 1/2, Interventional, and Treatment

Phase
Phase 1/2
Study type
Interventional
Enrollment
20
Allocation
Randomized
Ages
19 Years to 50 Years
Sex
All
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Study summary

Twenty healthy volunteers had their baseline parameters (symptoms, bowel habit, quality of life, fecal characteristics and microbiota) measured during a week of monitoring followed by randomization to a 14 days course of increased fiber in diet or increased fiber and water intake, with repetition of parameters measuring at the end.

Read the detailed description

Demographic and clinical data were collected and recorded in the first interview after signing the informed consent. The protocol was composed of two phases. The baseline phase lasted 7 days, when participants reported their usual diet on a food dairy in the first 3 days, between Sunday and Tuesday. Calculation of nutrient intake was performed using ADS nutri software (UFPEL, Pelotas, Brazil). Participants approved for the next phase were then randomized to fiber and fiber+water groups, which lasted 14 days. During this period participants were asked to report their intestinal habits including bowel movements, graduation of straining and subjective stool consistency. Participants were instructed to rank straining using a Likert scale from 1 (minimum) to 5 (maximum), and the Bristol scale for stool consistency. In the last day of treatment phase (Saturday) participants collected feces and urine of 24 hours, and responded a symptoms questionnaire. Food and liquid intake were recorded on a diary during the last 3 days of treatment for comparison with the baseline phase stage.

02

Conditions studied

  • Dietary Habits
  • Bowel Dysfunction

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03

In context

Intestinal Diseases

963 studies on the registry are indexed under Intestinal Diseases; 174 are open to participants now.

This study's enrollment of 20 is below the median of 70 across 552 interventional studies indexed under Intestinal Diseases.

Browse Intestinal Diseases studies →

Lead sponsor

Universidade de Passo Fundo is the lead sponsor of 13 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
19 Years to 50 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • non-obese
  • absence of abdominal complaints

Exclusion criteria

Exclusion Criteria:

  • use of medications that interfere with the gastrointestinal tract function
  • past of abdominal surgery
  • any acute or chronic disease
05

Study design

Phase
Phase 1 / Phase 2
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
20 participants (actual)

Study arms

  • Sham comparator
    Fiber

    Participants were treated with 2 sachets of fiber orally a day for 14 days, after baseline characterization of bowel habit and stool features.

    Dietary Supplement: Fiber

  • Active comparator
    Fiber and Water

    Participants were treated with 2 sachets of fiber orally a day and ingested 2 liters of water a day for 14 days, after baseline characterization of bowel habit and stool features.

    Dietary Supplement: Fiber and Water

Interventions

  • Dietary supplementFiber

    Fiber composed of wheat bran, pectin and green banana flour (total daily amount of 13 g for women and 20 g for men), keeping the usual liquid intake

  • Dietary supplementFiber and Water

    Fiber composed of wheat bran, pectin and green banana flour (total daily amount of 13 g for women and 20 g for men) plus 2 liter of water/day

06

What researchers measure

Primary outcomes

  1. bowel habit: evacuation frequency

    The patient reported in a diary the number of evacuations per day during 14 days of experimental use of fiber or fiber+water

    Time frame: 14 days

  2. bowel habit: straining

    The patient reported the effort for each evacuation using a Likert scale between 1 and 5 (1 = no effort / 5 = maximal) during 14 days of experimental use of fiber or fiber+water

    Time frame: 14 days

  3. bowel habit: stool consistency

    The patient reported the stool consistency of evacuations using a Bristol scale during 14 days of experimental use of fiber or fiber+water

    Time frame: 14 days

Secondary outcomes

  1. Abdominal symptoms

    self report of any abdominal symptom (yes/not) during treatment with fiber or fiber+water, including: pain, discomfort, distension, defecation urgency, backpain

    Time frame: 14 days

  2. Stool characteristics: fecal weight

    A sample of feces was collected at the end of 14 days treatment and analyzed for fecal weight (g)

    Time frame: 14 days

  3. Stool characteristics: percentage of water

    A sample of feces was collected at the end of 14 days treatment and analyzed for water percentage

    Time frame: 14 days

  4. Stool characteristics: pH

    A sample of feces was collected at the end of 14 days treatment and analyzed for measurement of pH

    Time frame: 14 days

  5. Intestinal microbiota

    A sample of feces was collected at the end of 14 days treatment for PCR analyses of 10 bacteria groups.

    Time frame: 14 days

07

Study locations

No study locations are listed for this record.

08

References and documents

Publications

  • Goncalves GVR, Canova R, Callegari-Jacques SM, Frandoloso R, Kreutz LC, Fornari F. Short-term intestinal effects of water intake in fibre supplementation in healthy, low-habitual fibre consumers: a phase 2 clinical trial. Int J Food Sci Nutr. 2022 Sep;73(6):841-849. doi: 10.1080/09637486.2022.2079117. Epub 2022 May 23. PubMed 35603590 ↗

Individual participant data

Plan to share: No

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 20, 2016, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT02838849
Lead sponsor
Universidade de Passo Fundo
Responsible party
Fernando Fornari (Professor, Universidade de Passo Fundo) — Principal investigator
First posted
Jul 20, 2016
Start date
Aug 2015
Primary completion
Dec 2015
Completion
Jul 2016
Last update
Jul 20, 2016

Study contacts

Fernando Fornari, Professor
principal investigator · Universidade de Passo Fundo

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Jul 2016. You cannot join it, but the record below documents what was studied.

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