Effects of Mode of Administration of Soluble Fibre Blend on Glycemia, Appetite & Sensory Parameters

Study Overview
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Brief Summary
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Soluble, viscous fibre has been established as an effective dietary component for lowering postprandial glycemia and promoting satiety. The effectiveness of viscous fibre has been related to its ability to increase the viscosity of the intra-luminal contents of the small intestine. Hence, the proposed mechanism with which soluble fibre affects the glycemic response, dependent on the viscosity development in the gut, would require that soluble fibre be extractable from the food matrix. This, in part, may be dependent on the food matrix that the soluble fibre is incorporated in. While properties of soluble fibre and their physiological effects have been studied extensively, limited data exists on the most effective mode of administration of fibre to optimize benefits. Furthermore, there are no studies to date that have evaluated how different modes of highly viscous soluble fibre would affect the subsequent meal. Hence, we propose a research study to determine whether the form of administration, taking into consideration the carbohydrate availability of a viscous fibre blend supplement, has a significant impact on postprandial and second meal glycemic response and subjective satiety in healthy individuals.

Detailed Description
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Following a 10-12 hr overnight fast, subjects will visit the Risk Factor Modification Centre between 8:00 am and 1:00 pm. Blood pressure and anthropometric measurements, including body weight, height, and % body fat will be taken. An initial finger prick fasting blood sample will be taken and a subjective appetite questionnaire in the form of a 100 mm visual analog scale will be completed. Subsequently, one of the 5 study meals will be administered to the subject to consume over a 10-15 minute duration accompanied by 300ml of water. Subjects will then be asked to complete a palatability questionnaire. Over the following 3 hours capillary blood samples will be taken by finger pricks at 15, 30, 45, 60, 90, 120 and 180 minutes post treatment. Appetite and symptoms questionnaires will be completed at 15, 30, 45, 60, 75, 90, and 120. At 180 min, a second standardized meal will be administered, consisting of 400kcal of pizza and 200ml of water. Further finger pick blood samples will be taken at 15, 30, 45, 60 and 120 min post pizza consumption. Upon completion of the visit, subjects will be given a 24-hour symptoms questionnaire to complete at home as an additional safety measure for a 24-hour period.

Official Title
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The Effects of Different Modes of Administration of Soluble Fibre on Postprandial and Second Meal Blood Glucose Response, Appetite and Sensory Parameters in Healthy Individuals

Conditions
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Healthy

Intervention / Treatment
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* Dietary Supplement: Soluble viscous fibre blend powder in hydrophobic matrix
* Dietary Supplement: Soluble viscous fibre blend in pre hydrated form
* Dietary Supplement: No soluble viscous fibre blend
* Dietary Supplement: Soluble viscous fibre blend premixed with ½ carbohydrate gel
* Dietary Supplement: No soluble viscous fibre blend, ½ carbohydrate jello


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: age 18-65 years normal glycemic response BMI between 18.5 - 25 kg/m2 peripheral systolic and diastolic blood pressure <140 mmHg and <90 mmHg, respectively. Exclusion Criteria: Known reported history of liver or kidney disease, diabetes, hypertension, stroke or myocardial infarctions, thyroid disease, Celiac disease/gastrointestinal disease, or AIDS allergies to any of the test products Presence of an eating disorder Following a restrictive dieting regime Weight loss of >5kg in last 2 months Smoking cigarettes Alcohol intake >2 drinks/day using prescription medications or Natural Health Products; any condition which, in the opinion of the investigator might jeopardize the health and safety of the subject or study personnel, or adversely affect the study results

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Treatment # 1<br>Soluble viscous fibre blend powder in hydrophobic matrix | Dietary Supplement: Soluble viscous fibre blend powder in hydrophobic matrix<br>* 5g soluble viscous fibre blend pre-mixed into margarine (hydrophobic matrix) + white bread + jello<br>|
| Experimental: Treatment # 2<br>Soluble viscous fibre blend in pre hydrated form | Dietary Supplement: Soluble viscous fibre blend in pre hydrated form<br>* 0g soluble viscous fibre blend margarine + white bread +5g Konjac fibre prehydrated in jello<br>|
| Placebo Comparator: Control # 1<br>No soluble viscous fibre blend | Dietary Supplement: No soluble viscous fibre blend<br>* 0g soluble viscous fibre blend margarine + white bread + jello<br>|
| Experimental: Treatment # 3<br>Soluble viscous fibre blend premixed with ½ carbohydrate gel | Dietary Supplement: Soluble viscous fibre blend premixed with ½ carbohydrate gel<br>* Margarine + white bread (1/2 carbohydrate) +5g soluble viscous fibre blend hydrated in jello with glucose<br>|
| Placebo Comparator: Control # 2<br>No soluble viscous fibre blend, ½ carbohydrate jello | Dietary Supplement: No soluble viscous fibre blend, ½ carbohydrate jello<br>* Margarine + white bread (1/2 carbohydrate) +5g soluble viscous fibre blend hydrated in jello with glucose<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Postprandial glycemia | To investigate the effectiveness of soluble dietary fibre blend supplementation depending on 1) mode of administration and 2) carbohydrate incorporation on reducing postprandial glycemia when consumed with a standardized test breakfast. | 5 hours | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Satiety | To investigate the effectiveness of soluble dietary fibre blend supplementation depending on 1) mode of administration and 2) carbohydrate incorporation on subjective satiety when consumed with a standardized test breakfast. At each visit, participants will record their subjective ratings using a 100mm visual analogue scale and these ratings will be combined into a total subjective appetite score. | 5 hours | 
| Second Meal Glycemia | To investigate the effectiveness of these different methods of administration of konjac fibre blend on postprandial glycemia of the second standardized meal. | 2 hours | 
| Palatability | At each visit, participants will record their subjective ratings using a 100mm visual analogue scale and these ratings will be combined into a total subjective palatability score. | 5 hours | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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soluble fiber, second meal effect, glycemia, satiety, Individuals