Polyphenol Supplementation and Morbid Obesity Parameters

Influence of a Polyphenol-rich Supplement on Anthropometric, Biochemical and Inflammatory Parameters in Participants With Morbid Obesity

This parallel, double-blind, randomised controlled trial aims to assess the effect of a polyphenol-rich dietary supplement on obesity parameters, in combination with a hypocaloric diet, for adults with morbid obesity, bariatric surgery candidates.

Participants (n=40) will be randomly assigned to intervention group (IG) or control group (CG). Together with a regular hypocaloric diet (1,200 kcal/d), the IG will be given the supplement and the CG will be given a placebo. Both groups will take three capsules a day (400 mg per capsule, a total of 1,200 mg), distributed in three daily intakes (with meals). After 12 weeks and 3 visits (baseline visit, week 6 and week 12), pre and post intervention data and intervention versus placebo data will be analysed. Anthropometric and health parameters, dietary habits, lifestyle characteristics and physical activity will be assessed, and blood and urine samples will be collected in all three visits. Faecal samples will be collected at baseline and visit 3.

Results will provide evidence on the effects of a combination of polyphenols on several well-established obesity parameters and will unravel possible underlying mechanisms by metabolomic analyses and microbiota diversity.

Study Overview

• Status: Completed
• Conditions: Morbid Obesity
• Intervention / Treatment: Other: Placebo; Dietary supplement: Polyphenol-rich supplement

Detailed Description

The main objective of this study is to assess the effect of a polyphenol-rich dietary supplement, along with a hypocaloric diet, on obesity parameters in participants with morbid obesity. Anthropometric, biochemical and inflammatory parameters, as well as different metabolic pathways and microbiota diversity will be assessed.

The estimated number of participants to include is 40. They will be patients with morbid obesity, referred to the Endocrinology and Nutrition Unit from Bellvitge University Hospital for a weight loss treatment, in many cases prior to a bariatric surgery. To estimate the sample size the following assumptions were made: same number of participants in each group; 10% variation in anthropometric and laboratory measurements; trial power of 0.85 and alfa error of 5%; estimated losses to follow-up: 15%.

The main component of the intervention is a polyphenol-rich dietary supplement administrated for 12 weeks. Lifestyle, dietary, physical activity data and blood and urine samples will be collected in three visits (baseline, week 6 and week 12); faecal samples will be collected in visits baseline and week 12. All participants will follow a hypocaloric diet and will be randomly assigned to either intervention group (IG) or control group (CG) after recruitment, following a simple randomisation procedure. The IG will take the supplement (3 capsules/day), whereas the CG will take a placebo (3 capsules/day).

This trial will be carried out following the ethical guidelines of the Declaration of Helsinki, the Principles of the Good Clinical Practice, under the existing legislation. Data collected will be kept strictly confidential. Any participant will have the right to access, rectification, cancellation and opposition over such data in accordance with the Organic Law 15/1999, Personal Data Protection. All information will be stored in a Data Collection Notebook, from which the database will be created.

All participants will be provided with an information sheet and will have to sign a consent form before the beginning of this trial. Any participant will be allowed to abandon the study for any reason: if requested; if the suspension is in the medical interest; if an incidence is presented as a consequence of the intervention, inacceptable or representing a threat to the participants' health; if the participant presents any breakthrough disease or other condition that, according to the principal investigator (PI), are relevant to suspend the intervention.

Data on medical history, lifestyle and sociodemographic characteristics will be collected through participants' clinical records and interviews at baseline. The standard hypocaloric diet (1200 kcal) that participants will have to follow for the entire 12 weeks of the study will be explained to each participant on the first visit.

On each visit participants will provide a 3-day food record, completed the three days preceding such visits. Qualified staff will collect data on dietary habits through a 24-hours dietary recall and will take anthropometric measurements, including height, weight, hip and waist circumference, body composition using an ergonomic measuring tape and a bioimpedance scan. Dietary and anthropometric assessment will be performed following the standard procedures from the Dietetic and Clinical Nutrition Unit from Bellvitge University Hospital.

Programari de Càlcul Nutricional Pro 1.0 Software, developed by University of Barcelona, will be used to assess dietary and nutritional intake. It includes a high-quality contrasted database which makes possible to calculate and analyse nutritional intake and body composition.

Phenol-Explorer database will be used to assess polyphenol intake. It is the first comprehensive database on polyphenol content in foods which takes into account food processing and cooking and contains more than 35,000 content values for 500 different polyphenols over 400 foods.

On each visit qualified staff will collect data on physical activity through a shortened version in Spanish of the Minnesota Leisure Time Physical Activity Questionnaire and will measure blood pressure through a semi-automated oscillometer.

Prior to each visit participants will need to fast for 12 hours as they will have blood samples taken. On each visit, 20ml of blood will be extracted from the antecubital vein and will be centrifuged and stored at -80ºC until used. Biochemical analyses will be performed by the Bellvitge University Hospital analysis laboratory. Blood tests will include rutinary hematology and biochemistry, and inflammatory parameters.

On each visit participants will have to 24-hour urine samples. Three aliquots (2 ml each) will be stored at -80ºC in the ultra-freezers of the Unit of Nutrition and Cancer, Institut d'Investigació Biomedica de Bellvitge (IDIBELL) (Barcelona, Spain). One aliquot will be used to measure cortisol in the clinical laboratory of the Bellvitge University Hospital. Another aliquot will be used to perform a metabolomic analysis by the Nutritional Biomarkers and Metabolomics group from the University of Barcelona. About ≈ 500 metabolites (e.g., polyphenols and microbiota metabolites, organic acids, energetic and protein metabolism compounds) will be quantified using ultra-high performance liquid chromatography coupled to tandem mass spectrometry. This will allow us to monitor metabolite alterations derived from the polyphenol-rich supplement and associate these changes with improvements in clinical and biochemical outcome measurements.

Participants will bring a faecal sample in the first and third visit. These samples will be analysed in future microbiota studies. They will be kept stored at -80ºC in the ultra-freezers of the Unit of Nutrition and Cancer, IDIBELL.

Statistical analysis plan: intention-to-treat and per-protocol analyses will be performed. The main variable to assess is body weight and body composition. Secondary variables include biochemical and inflammatory parameters, urine metabolites and microbiota. Pre and post data, and IG versus CG results will be compared using Student t-test for paired and for independent samples, respectively.

• Study Type: Interventional
• Enrollment (Actual): 37
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Spain
  • Barcelona
    • L'Hospitalet De Llobregat, Barcelona, Spain, 08907
      • Hospital Universitario de Bellvitge

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Adults ≥ 18 years old
• Presenting morbid obesity defined as BMI ≥ 40 kg/m2
• Referred to the Endocrinology and Nutrition Unit from Bellvitge University Hospital for a weight loss treatment

Exclusion Criteria:

• History of type I diabetes
• Endocrine disorders-derived obesity
• Acute metabolic complications
• Severe inflammatory process that might affect the inflammatory condition during the 4 weeks before inclusion
• Cardiovascular event during the 6 months before inclusion
• History of hepatopathy or alteration of hepatic function
• Pregnant, lactation period or willing to get pregnant in the 12 weeks after inclusion
• Recent history of neoplasia (< 5 years) except for skin cancer or melanoma
• Oral or IV line glucocorticoids during 14 consecutive days or more 3 months before inclusion
• Alcoholism, drug addiction or major psychiatric disorder

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Intervention group; Polyphenol-rich dietary supplement (3 capsules/day) + hypocaloric diet (1,200 kcal/day)	Dietary supplement: Polyphenol-rich supplement; Polyphenol-rich capsules containing 1,200 mg of a combination of plant extracts rich in polyphenols. Frequency: 3 capsules a day. Duration: 12 weeks.
Placebo Comparator: Control group; Placebo (3 capsules/day) + hypocaloric diet (1,200 kcal/day)	Other: Placebo; Placebo

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Body weight	Unit: Kilograms Measured with:bioimpedance scan	Visit 1 (baseline)
Body weight	Unit: Kilograms Measured with:bioimpedance scan	Visit 2 (week 6)
Body weight	Unit: Kilograms Measured with:bioimpedance scan	Visit 3 (week 12)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Systolic blood pressure	Unit: mmHg Measured with: oscillometer	Visit 1 (baseline)
Diastolic blood pressure	Unit: mmHg Measured with: oscillometer	Visit 1 (baseline)
Systolic blood pressure	Unit: mmHg Measured with: oscillometer	Visit 2 (week 6)
Diastolic blood pressure	Unit: mmHg Measured with: oscillometer	Visit 2 (week 6)
Systolic blood pressure	Unit: mmHg Measured with: oscillometer	Visit 3 (week 12)
Diastolic blood pressure	Unit: mmHg Measured with: oscillometer	Visit 3 (week 12)
Dietary intake	24-h dietary recall	Visit 1 (baseline)
Dietary intake	24-h dietary recall	Visit 2 (week 6)
Dietary intake	24-h dietary recall	Visit 3 (week 12)
Physical activity level	Formula: metabolic energy turnover (MET) according to Ainsworth proposal (Compendium of Physical Activities, 2011) Unit: METS-minute/14 days Scale: <1250: sedentary 1250 to 2999: moderately active 3000-4999: active >=5000: very active	Visit 1 (baseline)
Physical activity level	Formula: metabolic energy turnover (MET) according to Ainsworth proposal (Compendium of Physical Activities, 2011) Unit: METS-minute/14 days Scale: <1250: sedentary 1250 to 2999: moderately active 3000-4999: active >=5000: very active	Visit 2 (week 6)
Physical activity level	Formula: metabolic energy turnover (MET) according to Ainsworth proposal (Compendium of Physical Activities, 2011) Unit: METS-minute/14 days Scale: <1250: sedentary 1250 to 2999: moderately active 3000-4999: active >=5000: very active	Visit 3 (week 12)
Alanine aminotransferase	Measured through plasma concentrations: Unit: units/litre	Visit 1 (baseline)
Alanine aminotransferase	Measured through plasma concentrations: Unit: units/litre	Visit 2 (week 6)
Alanine aminotransferase	Measured through plasma concentrations: Unit: units/litre	Visit 3 (week 12)
Aspartate aminotransferase	Measured through plasma concentrations Units: units/litre	Visit 1 (baseline)
Aspartate aminotransferase	Measured through plasma concentrations Units: units/litre	Visit 2 (week 6)
Aspartate aminotransferase	Measured through plasma concentrations Units: units/litre	Visit 3 (week 12)
Bilirrubin	Measured through plasma concentrations Unit: mg/dl	Visit 1 (baseline)
Bilirrubin	Measured through plasma concentrations Unit: mg/dl	Visit 2 (week 6)
Bilirrubin	Measured through plasma concentrations Unit: mg/dl	Visit 3 (week 12)
Thyroid-stimulating hormone (TSH)	Measured through plasma concentrations (mU/litre)	Visit 1 (baseline)
Thyroid-stimulating hormone (TSH)	Measured through plasma concentrations (mU/litre)	Visit 2 (week 6)
Thyroid-stimulating hormone (TSH)	Measured through plasma concentrations (mU/litre)	Visit 3 (week 12)
Thyroxine	Measured through plasma concentrations (ng/dl)	Visit 1 (baseline)
Thyroxine	Measured through plasma concentrations (ng/dl)	Visit 2 (week 6)
Thyroxine	Measured through plasma concentrations (ng/dl)	Visit 3 (week 12)
Creatinin	Measured through plasma concentrations (mg/dl)	Visit 1 (baseline)
Creatinin	Measured through plasma concentrations (mg/dl)	Visit 2 (week 6)
Creatinin	Measured through plasma concentrations (mg/dl)	Visit 3 (week 12)
Urea	Measured through plasma concentrations (mg/dl)	Visit 1 (baseline)
Urea	Measured through plasma concentrations (mg/dl)	Visit 2 (week 6)
Urea	Measured through plasma concentrations (mg/dl)	Visit 3 (week 12)
Erithrocytes	Plasma concentrations (cel/mcl)	Visit 1 (baseline)
Erithrocytes	Plasma concentrations (cel/mcl)	Visit 2 (week 6)
Erithrocytes	Plasma concentrations (cel/mcl)	Visit 3 (week 12)
Hemoglobin	Plasma concentrations (g/dl)	Visit 1 (baseline)
Hemoglobin	Plasma concentrations (g/dl)	Visit 2 (week 6)
Hemoglobin	Plasma concentrations (g/dl)	Visit 3 (week 12)
Leucocytes	Plasma concentrations (cel/mcl)	Visit 1 (baseline)
Leucocytes	Plasma concentrations (cel/mcl)	Visit 2 (week 6)
Leucocytes	Plasma concentrations (cel/mcl)	Visit 3 (week 12)
Total cholesterol	Plasma concentrations (mg/dl)	Visit 1 (baseline)
Total cholesterol	Plasma concentrations (mg/dl)	Visit 2 (week 6)
Total cholesterol	Plasma concentrations (mg/dl)	Visit 3 (week 12)
LDL (low-density lipoprotein)-cholesterol	Plasma concentrations (mg/dl)	Visit 1 (baseline)
LDL (low-density lipoprotein)-cholesterol	Plasma concentrations (mg/dl)	Visit 2 (week 6)
LDL (low-density lipoprotein)-cholesterol	Plasma concentrations (mg/dl)	Visit 3 (week 12)
HDL (high-density lipoprotein)-cholesterol	Plasma concentrations (mg/dl)	Visit 1 (baseline)
HDL (high-density lipoprotein)-cholesterol	Plasma concentrations (mg/dl)	Visit 2 (week 6)
HDL (high-density lipoprotein)-cholesterol	Plasma concentrations (mg/dl)	Visit 3 (week 12)
Triglycerides	Plasma concentrations (mg/dl)	Visit 1 (baseline)
Triglycerides	Plasma concentrations (mg/dl)	Visit 2 (week 6)
Triglycerides	Plasma concentrations (mg/dl)	Visit 3 (week 12)
Glucose	Plasma concentrations (mg/dl)	Visit 1 (baseline)
Glucose	Plasma concentrations (mg/dl)	Visit 2 (week 6)
Glucose	Plasma concentrations (mg/dl)	Visit 3 (week 12)
Glycosylated hemoglobin	Measured through plasma concentrations Unit: %	Visit 1 (baseline)
Glycosylated hemoglobin	Measured through plasma concentrations Unit: %	Visit 2 (week 6)
Glycosylated hemoglobin	Measured through plasma concentrations Unit: %	Visit 3 (week 12)
Insulin	Measured through plasma concentrations Unit/ml	Visit 1 (baseline)
Insulin	Measured through plasma concentrations Unit/ml	Visit 2 (week 6)
Insulin	Measured through plasma concentrations Unit/ml	Visit 3 (week 12)
TNF-alpha receptor I	Measured through plasma levels (pg/ml)	Visit 1 (baseline)
TNF-alpha receptor I	Measured through plasma levels (pg/ml)	Visit 2 (week 6)
TNF-alpha receptor I	Measured through plasma levels (pg/ml)	Visit 3 (week 12)
TNF-alpha receptor II	Measured through plasma levels (pg/ml)	Visit 1 (baseline)
TNF-alpha receptor II	Measured through plasma levels (pg/ml)	Visit 2 (week 6)
TNF-alpha receptor II	Measured through plasma levels (pg/ml)	Visit 3 (week 12)
Interleukin-6	Measured through plasma levels (pg/ml)	Visit 1 (baseline)
Interleukin-6	Measured through plasma levels (pg/ml)	Visit 2 (week 6)
Interleukin-6	Measured through plasma levels (pg/ml)	Visit 3 (week 12)
Adiponectin	Measured through plasma levels (ug/ml)	Visit 1 (baseline)
Adiponectin	Measured through plasma levels (ug/ml)	Visit 2 (week 6)
Adiponectin	Measured through plasma levels (ug/ml)	Visit 3 (week 12)
high sensitivity c-reactive protein	Measured through plasma levels (mg/l)	Visit 1 (baseline)
high sensitivity c-reactive protein	Measured through plasma levels (mg/l)	Visit 2 (week 6)
high sensitivity c-reactive protein	Measured through plasma levels (mg/l)	Visit 3 (week 12)
Waist circumference	Unit: centimetres Measured with: ergonomic measuring tape	Visit 1 (baseline)
Waist circumference	Unit: centimetres Measured with: ergonomic measuring tape	Visit 2 (week 6)
Waist circumference	Unit: centimetres Measured with: ergonomic measuring tape	Visit 3 (week 12)
Hip circumference	Unit: centimetres Measured with: ergonomic measuring tape	Visit 1 (baseline)
Hip circumference	Unit: centimetres Measured with: ergonomic measuring tape	Visit 2 (week 6)
Hip circumference	Unit: centimetres Measured with: ergonomic measuring tape	Visit 3 (week 12)
Fat mass	Unit: % Measured with: bioimpedance scan	Visit 1 (baseline)
Fat mass	Unit: % Measured with: bioimpedance scan	Visit 2 (week 6)
Fat mass	Unit: % Measured with: bioimpedance scan	Visit 3 (week 12)
Muscle mass	Unit: % Measured with: bioimpedance scan	Visit 1 (baseline)
Muscle mass	Unit: % Measured with: bioimpedance scan	Visit 2 (week 6)
Muscle mass	Unit: % Measured with: bioimpedance scan	Visit 3 (week 12)

Collaborators and Investigators

• Sponsor: Institut d'Investigació Biomèdica de Bellvitge

Study record dates

Study Major Dates

• Study Start (Actual): August 8, 2022
• Primary Completion (Actual): June 16, 2023
• Study Completion (Actual): June 16, 2023

Study Registration Dates

• First Submitted: June 10, 2022
• First Submitted That Met QC Criteria: June 17, 2022
• First Posted (Actual): June 23, 2022

Study Record Updates

• Last Update Posted (Actual): August 9, 2023
• Last Update Submitted That Met QC Criteria: August 8, 2023
• Last Verified: August 1, 2023

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Overnutrition; Nutrition Disorders; Overweight; Body Weight; Obesity; Obesity, Morbid
• Other Study ID Numbers: Polyphenols and morbid obesity

Drug and device information, study documents

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