Brown Seaweeds Effect on Glucose Tolerance and Appetite Response

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

20 participants

Study Classification

INTERVENTIONAL

Study Start Date

2015-05-31

Study Completion Date

2015-08-31

Brief Summary

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The project is a randomized, 3-way, blinded crossover trial in which 20 healthy, fasted participants consume meals with 30 g of a linear corn starch and 5 g of one of the seaweeds, Laminara digitata or Undaria pinnatifida or a pea protein control. The primary aim is to investigate whether the brown seaweeds affect the postprandial glucose Area Under the Curve (AUC). Stomach emptying, insulin, C-peptide, appetite-regulating hormones (oxyntomodulin, glucagon, GLP-1 and PYY), and specific metabolites from the seaweeds in the urine and plasma as well as subjective satiety are also analyzed.

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Detailed Description

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Brown seaweeds may contain bioactive compounds as they contain secondary plant metabolites, including flavonoids and other phenolic compounds as well as carotenoids. Dietary fibre is the major component of brown seaweeds, mainly composed from laminarans, alginates, fucans and cellulose. Several dietary fibers and secondary plant metabolites have been shown to have an impact on health and more specifically on glycemic control. Therefore, the aim of this study was to investigate whether two selected brown seaweeds have an effect on the postprandial glucose response to a starch load as well as several secondary measures, including appetite responses.

In a controlled crossover trial, 20 healthy fasted participants consumed 5 g of either Laminaria digitata (LD) or Undaria pinnatifida (UP) or 1 g of pea protein (CTR). The volunteers concomitantly ingested 200 mL of a drink with corn starch. Blood samples were drawn at baseline, as well as 20, 40, 60, 90, 120 and 180 min after the meal. Differences in glucose, insulin, C-peptide, plasma incretin concentrations, and insulin sensitivity index (ISI) were analyzed and appetite was scored by a visual analogue scale and a subsequent ad libitum test meal.

Conditions

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High Blood Glucose

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Primary Study Purpose

PREVENTION

Blinding Strategy

DOUBLE

Investigators Outcome Assessors

Study Groups

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Sequence A

The meal study was performed with Laminaria digitata (LD), Undaria pinnatifida (UP) or pea protein drink (CTR) in the sequence LD-UP-CTR

Group Type EXPERIMENTAL

LD

Intervention Type OTHER

Participants ingested 5 g of Laminaria digitata followed by 30 g of corn starch mixed with 200 mL of water.

UP

Intervention Type OTHER

Participants ingested 5 g of Undaria pinnatifida followed by 30 g of corn starch mixed with 200 mL of water.

CTR

Intervention Type OTHER

Participants ingested 30 g of corn starch and 1 g of pea protein powder mixed with 200 mL of water.

Sequence B

The meal study was performed with Laminaria digitata (LD), Undaria pinnatifida (UP) or pea protein drink (CTR) in the sequence LD-CTR-UP

Group Type EXPERIMENTAL

LD

Intervention Type OTHER

Participants ingested 5 g of Laminaria digitata followed by 30 g of corn starch mixed with 200 mL of water.

UP

Intervention Type OTHER

Participants ingested 5 g of Undaria pinnatifida followed by 30 g of corn starch mixed with 200 mL of water.

CTR

Intervention Type OTHER

Participants ingested 30 g of corn starch and 1 g of pea protein powder mixed with 200 mL of water.

Sequence C

The meal study was performed with Laminaria digitata (LD), Undaria pinnatifida (UP) or pea protein drink (CTR) in the sequence UP-LD-CTR

Group Type EXPERIMENTAL

LD

Intervention Type OTHER

Participants ingested 5 g of Laminaria digitata followed by 30 g of corn starch mixed with 200 mL of water.

UP

Intervention Type OTHER

Participants ingested 5 g of Undaria pinnatifida followed by 30 g of corn starch mixed with 200 mL of water.

CTR

Intervention Type OTHER

Participants ingested 30 g of corn starch and 1 g of pea protein powder mixed with 200 mL of water.

Sequence D

The meal study was performed with Laminaria digitata (LD), Undaria pinnatifida (UP) or pea protein drink (CTR) in the sequence UP-CTR-LD

Group Type EXPERIMENTAL

LD

Intervention Type OTHER

Participants ingested 5 g of Laminaria digitata followed by 30 g of corn starch mixed with 200 mL of water.

UP

Intervention Type OTHER

Participants ingested 5 g of Undaria pinnatifida followed by 30 g of corn starch mixed with 200 mL of water.

CTR

Intervention Type OTHER

Participants ingested 30 g of corn starch and 1 g of pea protein powder mixed with 200 mL of water.

Sequence E

The meal study was performed with Laminaria digitata (LD), Undaria pinnatifida (UP) or pea protein drink (CTR) in the sequence CTR-LD-UP

Group Type EXPERIMENTAL

LD

Intervention Type OTHER

Participants ingested 5 g of Laminaria digitata followed by 30 g of corn starch mixed with 200 mL of water.

UP

Intervention Type OTHER

Participants ingested 5 g of Undaria pinnatifida followed by 30 g of corn starch mixed with 200 mL of water.

CTR

Intervention Type OTHER

Participants ingested 30 g of corn starch and 1 g of pea protein powder mixed with 200 mL of water.

Sequence F

The meal study was performed with Laminaria digitata (LD), Undaria pinnatifida (UP) or pea protein drink (CTR) in the sequence CTR-UP-LD

Group Type EXPERIMENTAL

LD

Intervention Type OTHER

Participants ingested 5 g of Laminaria digitata followed by 30 g of corn starch mixed with 200 mL of water.

UP

Intervention Type OTHER

Participants ingested 5 g of Undaria pinnatifida followed by 30 g of corn starch mixed with 200 mL of water.

CTR

Intervention Type OTHER

Participants ingested 30 g of corn starch and 1 g of pea protein powder mixed with 200 mL of water.

Interventions

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LD

Participants ingested 5 g of Laminaria digitata followed by 30 g of corn starch mixed with 200 mL of water.

Intervention Type OTHER

UP

Participants ingested 5 g of Undaria pinnatifida followed by 30 g of corn starch mixed with 200 mL of water.

Intervention Type OTHER

CTR

Participants ingested 30 g of corn starch and 1 g of pea protein powder mixed with 200 mL of water.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

BMI 20-25 kg/m2. Waist circumference \< 102 cm. Non-smoking. Like (can tolerate) seaweed, pasta, meat sauce as these foods are part of the test meal.

Can tolerate paracetamol (Pinex, Actavis, Denmark).

Exclusion Criteria

Systemic infections, psychiatric or metabolic diseases, and any clinical condition, chronic or frequent use of medication (including blood thinners, excluding contraceptives), smoking (throughout the trial and 12 months before the start of the experiment), blood donations during or in the month leading up to the study period, elite athletes (\> 10 hours of hard exercise / week, self-reported), high intake of alcohol (defined as a weekly intake of \> 7 units for women and \> 14 units for men), have or have had a drug addiction, participation in other scientific studies during the study period, lactating, pregnancy or ongoing planning of pregnancy, and vegetarianism or veganism.

Minimum Eligible Age

20 Years

Maximum Eligible Age

50 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes