Effect of the Consumption of Burgers Prepared With Wine Grape Pomace Flour, on Components of the Metabolic Syndrome (WGPF-burger)

Effect of the Consumption of Burgers Prepared With Wine Grape Pomace Flour, Rich in Fiber and Antioxidants, on Components of the Metabolic Syndrome in Humans

Wine grape pomace flour (WGPF) is a fruit byproduct high in fiber and antioxidants. The effect of WGPF consumption was tested on blood biochemical parameters including oxidative stress biomarkers. In a 3-month intervention study, 27 male volunteers, each with some components of metabolic syndrome, consumed a beef burger supplemented with 7% WGPF containing 3.5% of fiber and 1.2 mg GE/g of polyphenols (WGPF-burger), daily during the first month. The volunteers consumed no burgers in the second month, and one control burger daily in the third month. At baseline and after these periods, there were evaluated metabolic syndrome components, plasma antioxidant status [2,2-diphenyl-1-picrylhydrazyl radical scavenging capacity (DPPH),uric acid, vitamin E, vitamin C], and oxidative damage markers [advanced oxidation protein products (AOPP), oxidized low-density lipoproteins (oxLDL), malondialdehyde (MDA)].

Study Overview

• Status: Completed
• Conditions: Metabolic Syndrome; Food Selection
• Intervention / Treatment: Dietary supplement: WGPF-burger; Dietary supplement: Control-burger

Detailed Description

The intervention was carried out at workplaces in Santiago, Chile. Workers were informed about the study and invited to participate. Initially, 34 male workers meeting all criteria agreed to partake, however 27 workers completed the study. Seven volunteers quit the study because three disliked the blood sampling procedure, two were sent to work abroad, one left the workplace, and one presented gastrointestinal symptoms associated with WGPF-burger consumption.

The volunteers entered a longitudinal trial consisting of two treatment periods of 4 weeks, separated by a third four-week wash-out period. For the first 4 weeks, they consumed one WGPF-burger daily, then they were washed-out and finally they consumed one control-burger daily during 4 weeks. They were asked to maintain their regular eating habits and lifestyle during the study, except for the daily intake of burgers during the treatment periods. The burgers were eaten in replacement of red or processed meat consumption, or in addition to their regular meal when it did not contain meat products. During the washout period, all subjects consumed their usual diet. Burger intake was supervised every day at lunch at the canteens of the workplaces. On weekends, participants were asked to consume burgers at home with their regular meals. In addition, compliance with burger consumption was carefully monitored by frequent calls from the dietitian.

Blood samples were obtained at weeks 0, 4, 8, and 12 for analysis. Participants had clinical, nutritional, and anthropometric evaluations at the beginning and the end of the study.

• Study Type: Interventional
• Enrollment (Actual): 34
• Phase: Not Applicable

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 25 years to 65 years (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: Male

Description

Inclusion Criteria:

• The inclusion criteria were having at least one of the five components of metabolic syndrome and a BMI between 25.0 and 39.9 kg/m2

Exclusion Criteria:

• Exclusion criteria were use of drug therapy for diabetes mellitus, hypertension, or dyslipidemia and intake of pharmacological treatment with drugs that modify plasma antioxidant capacity or inflammation.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Intervention; WGPF-burger group	Dietary supplement: WGPF-burger; Volunteers consumed a WGPF-burger daily; Dietary supplement: Control-burger; Volunteers consumed a Control-burger daily
Placebo Comparator: Control; Control-burger group	Dietary supplement: Control-burger; Volunteers consumed a Control-burger daily

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Metabolic syndrome components	The presence of metabolic syndrome components was defined using the criteria proposed by the Adult Treatment Panel III of the US National Cholesterol Education Program: (i) abdominal obesity as waist circumference >102 cm for men; (ii) low levels (<40 mg/dL for men) of serum high density lipoprotein cholesterol; (iii) hypertriglyceridemia as 150 mg/dL or more; (iv) elevated blood pressure as 130/85 mm Hg or higher; and (v) impaired glucose homeostasis as fasting plasma glucose levels of 100 mg/dL or higher	Month 1, WFPG-burger consumption
Metabolic syndrome components	The presence of metabolic syndrome components was defined using the criteria proposed by the Adult Treatment Panel III of the US National Cholesterol Education Program: (i) abdominal obesity as waist circumference >102 cm for men; (ii) low levels (<40 mg/dL for men) of serum high density lipoprotein cholesterol; (iii) hypertriglyceridemia as 150 mg/dL or more; (iv) elevated blood pressure as 130/85 mm Hg or higher; and (v) impaired glucose homeostasis as fasting plasma glucose levels of 100 mg/dL or higher	Month 3, control burger consumption

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Insulin	Fasting plasma Insulin was measured by electrochemiluminescence immunoassay (ECLIA; Roche Diagnostics®).	Month 1, WFPG-burger consumption
Insulin	Fasting plasma Insulin was measured by electrochemiluminescence immunoassay (ECLIA; Roche Diagnostics®).	Month 3, control burger consumption
Antioxidants	Antioxidants measurements: 2,2-diphenyl-1-picrylhydrazyl radical scavenging capacity (DPPH), uric acid, vitamin E, vitamin C	Month 1, WFPG-burger consumption
Antioxidants	Antioxidants measurements: 2,2-diphenyl-1-picrylhydrazyl radical scavenging capacity (DPPH), uric acid, vitamin E, vitamin C	Month 3, control burger consumption
Oxidative stress	Oxidative stress markers: Advanced oxidation protein products (AOPP), oxidized low-density lipoproteins (oxLDL), malondialdehyde (MDA)	Month 1, WFPG-burger consumption
Oxidative stress	Oxidative stress markers: Advanced oxidation protein products (AOPP), oxidized low-density lipoproteins (oxLDL), malondialdehyde (MDA)	Month 3, control burger consumption

Collaborators and Investigators

• Sponsor: Pontificia Universidad Catolica de Chile

Study record dates

Study Major Dates

• Study Start (Actual): June 15, 2016
• Primary Completion (Actual): October 15, 2016
• Study Completion (Actual): October 15, 2016

Study Registration Dates

• First Submitted: June 21, 2018
• First Submitted That Met QC Criteria: July 17, 2018
• First Posted (Actual): July 19, 2018

Study Record Updates

• Last Update Posted (Actual): July 19, 2018
• Last Update Submitted That Met QC Criteria: July 17, 2018
• Last Verified: July 1, 2018

More Information

Terms related to this study

• Keywords: Functional food; Intervention study; Grape pomace
• Additional Relevant MeSH Terms: Pathologic Processes; Glucose Metabolism Disorders; Metabolic Diseases; Disease; Insulin Resistance; Hyperinsulinism; Syndrome; Metabolic Syndrome
• Other Study ID Numbers: 15-122; IT14I10011 (Other Grant/Funding Number: FONDEF)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No