Grape Polyphenols and Second-meal Effect

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

25 participants

Study Classification

INTERVENTIONAL

Study Start Date

2018-12-10

Study Completion Date

2020-02-15

Brief Summary

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The aim of this is study is to evaluate the effects of a single intake of grapes (a polyphenol-rich food) in postprandial metabolism in subjects with obesity, including a first intake (high-fat breakfast) after overnight fasting a second one (medium-fat lunch). Studies on the effects of polyphenols on postprandial (glucidic and lipidic) metabolism have commonly been performed in animal models and have used grape extracts, ignoring the whole pool of polyphenols present in grapes (extractable and non-extractable polyphenols). Besides, the contribution of polyphenols to the so-called second-meal effect has not been explored. It should be highlighted that this study aims to explore the potential beneficial role of fresh grapes, consumed as fruit; in order to ensure the stability of the product, they will be provided as freeze-dried milled material, but the amount received by the subjects could be incorporated into a common diet, being equivalent to 300 g of fresh grapes.

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Detailed Description

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Twenty-five subjects with obesity will be were recruited. Detailed inclusion and exclusion criteria are provided below.

The subjects will receive, after overnight fasting, either a monodose of freeze-dried grapes (equivalent to 300 g of fresh grapes) or isocaloric placebo solved in water, together with a high-fat breakfast. Blood samples will be collected before the intake, up to 5 h after breakfast, then a medium-fat lunch will be provided and blood samples will be collected for three additional hours. Both interventions will be separated by two weeks. The following determinations will be performed in blood samples collected at different periods: glucose, insulin, triglycerides, uric acid, viscosity, antioxidant capacity. Additionally, a satiety test will be provided. It is expected that grape supplementation, as compared with an isocaloric placebo, causes significant modifications in all the parameters indicated. Nevertheless, the primary outcome of this study is the area under the curve for glucose after the second meal (300-420 min from basal time).

Conditions

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Obesity

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

GRAP: dried and milled grape pomaces. PLA: control period. All the subjects will pass the two periods: one half will receive the acute PLA supplementation followed by the acute GRAP supplementation, and the other half will do it inversely. The assignment to each order will be done randomly. Both period will be separated by a two weeks washing period.

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

DOUBLE

Participants Caregivers

GRAP and PLA will have the same aspect, so neither the participant and the care provider will know the received treatment at each stage.

Study Groups

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1

All subjects will receive a high-fat breakfast and a medium-fat lunch twice. They will consume together with the breakfast the placebo (PLA) the first time and grape (GRAP) the second time.

Group Type EXPERIMENTAL

Freeze-dried grape (GRAP)/Placebo (PLA)

Intervention Type OTHER

The subjects will receive, after overnight fasting, either a monodose of freeze-dried grapes (equivalent to 300 g of fresh grapes) or isocaloric placebo solved in water, together with a high-fat breakfast. Blood samples will be collected before the intake, up to 5 h after breakfast, then a medium-fat lunch will be provided and blood samples will be collected for three additional hours. A total of 10 samples will be collected: 0-30-60-120-180-240-300-330-360-420 min. Both interventions will be separated by two weeks. Subjects will be instructed not to modify their dietary habits during the development of the study, but during the 72 h before each visit they will have to restrict the intake of polyphenol-rich foods (a detailed list will be provided).

2

All subjects will receive a high-fat breakfast and a medium-fat lunch twice. They will consume together with the breakfast grape (GRAP) the first time and the placebo (PLA) the second time.

Group Type EXPERIMENTAL

Freeze-dried grape (GRAP)/Placebo (PLA)

Intervention Type OTHER

The subjects will receive, after overnight fasting, either a monodose of freeze-dried grapes (equivalent to 300 g of fresh grapes) or isocaloric placebo solved in water, together with a high-fat breakfast. Blood samples will be collected before the intake, up to 5 h after breakfast, then a medium-fat lunch will be provided and blood samples will be collected for three additional hours. A total of 10 samples will be collected: 0-30-60-120-180-240-300-330-360-420 min. Both interventions will be separated by two weeks. Subjects will be instructed not to modify their dietary habits during the development of the study, but during the 72 h before each visit they will have to restrict the intake of polyphenol-rich foods (a detailed list will be provided).

Interventions

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Freeze-dried grape (GRAP)/Placebo (PLA)

The subjects will receive, after overnight fasting, either a monodose of freeze-dried grapes (equivalent to 300 g of fresh grapes) or isocaloric placebo solved in water, together with a high-fat breakfast. Blood samples will be collected before the intake, up to 5 h after breakfast, then a medium-fat lunch will be provided and blood samples will be collected for three additional hours. A total of 10 samples will be collected: 0-30-60-120-180-240-300-330-360-420 min. Both interventions will be separated by two weeks. Subjects will be instructed not to modify their dietary habits during the development of the study, but during the 72 h before each visit they will have to restrict the intake of polyphenol-rich foods (a detailed list will be provided).

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Obesity (BMI = 30-40 kg/m2).

Exclusion Criteria

* Subjects with a pharmaceutical treatment set to modify blood pressure, lipid profile or glucose.
* Subjects with diagnoses of type 2 diabetes, cardiovascular diseases or thyroid diseases.
* Values above the following ones: glucose, \> 115 mg/dL; triglycerides, \> 350 mg/dL; total cholesterol, \> 280 mg/dL; systolic blood pressure, \> 150 mmHg; diastolic blood pressure, \> 100 mmHg
* Previous bariatric surgery.
* Volunteers participating in other studies (currently or during last year) or weight loss plans.
* Pregnant or breastfeeding women.
* Adherence to vegetarian diets or usual consumption of dietary supplements.

Minimum Eligible Age

18 Years

Maximum Eligible Age

70 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes