A Multicenter Pilot Study to Evaluate the Effect of EVOO on Lipid Parameters

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

Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.

Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

23 participants

Study Classification

INTERVENTIONAL

Study Start Date

2021-07-26

Study Completion Date

2022-12-22

Brief Summary

Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.

The purpose of this multi-center, double-blinded pilot study is to determine if extra virgin olive oil (EVOO) has a positive effect on HDL cholesterol levels and anti-inflammatory markers for subjects diagnosed with cardiovascular disease (CVD) and to determine if the polyphenol concentration is proportional to those effects. Subjects will complete consecutive 28-day periods (with a 14-day washout between) in which they will either consume the low polyphenol concentration EVOO daily or the high polyphenol concentration EVOO. In a double-blinded manner, each subject will be his or her own control with a 14-day washout between study periods. HDL levels and other parameters will be measured after each period of the protocol. The investigators anticipate HDL levels will improve with both olive oils. The investigators expect the high polyphenol concentration EVOO will show a greater effect than the EVOO with a low polyphenol concentration. EVOO with high polyphenol concentration may be a simple method to reduce the risk of secondary CVD events.

Related Clinical Trials

Explore similar clinical trials based on study characteristics and research focus.

Olive Oil and Cardiovascular Health

NCT01983943

Cardiovascular Disease Endothelial Function

WITHDRAWN NA

The Effect of Olive Leaf Extract Administration on Cardiovascular Health

NCT02990637

Overweight and Obesity Elevated Cholesterol

COMPLETED NA

Effect of Plant Stanol Ester-Containing Spread on Estimated Cardiovascular Risk in Comparison to Mediterranean Diet

NCT00793364

Hypercholesterolemia

COMPLETED PHASE4

New Industrial Procedures for Achieving a Nutritional Added Value of the Olive Oil. The NUTRAOLEUM Study

NCT02520739

Cardiovascular Diseases

UNKNOWN PHASE3

Nuts and Oil Pilot Study

NCT04361617

Metabolic Syndrome

COMPLETED NA

Detailed Description

Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.

Study Design:

A multi-center, double-blinded pilot study to determine if extra virgin olive oil (EVOO) has a positive effect on HDL cholesterol levels and anti-inflammatory markers for subjects diagnosed with cardiovascular disease (CVD) and to determine if the polyphenol concentration is proportional to those effects. Subjects will complete consecutive 28-day periods (with a 14-day washout between) in which they will either consume the low polyphenol concentration EVOO daily or the high polyphenol concentration EVOO. In a double-blinded manner, each subject will be his or her own control with a 14-day washout between study periods.

Hypothesis:

Subjects will demonstrate greater improvements in HDL cholesterol levels, other lipid parameters, and inflammatory markers by adding EVOO to their diets. Consumption of EVOO with high polyphenol concentration will improve these parameters more than consumption of EVOO with low polyphenol concentration.

Specific Aims:

1. To determine if daily consumption of EVOO will increase HDL cholesterol levels after 28 days.
2. To determine if daily consumption of high polyphenol concentration EVOO increases HDL cholesterol levels more than EVOO with a low polyphenol concentration (same dosing).
3. To determine the feasibility of this type of study and the possibility of a larger study over a longer time period.

Study Methods:

Prior to enrolling subjects, the study staff will order a generic brand EVOO through the hospital nutritional services department. At the same time, EVOO with a reported high polyphenol concentration will be ordered from a local olive oil specialty store.

Olive oil testing: Eurofins Microbiology Laboratories, Inc. will test a sample of each batch of olive oil for polyphenol concentration prior to dispensing. The method is based on direct extraction of the biophenolic minor polar compounds from olive oil by means of a methanol solution and subsequent quantification by HPLC-MS/MS. Commercially available polyphenol standards are used to identify and quantify individual phenolic compounds, focusing on those most abundant in olive oils.

Study subject blood testing: Approximately 20 ml of blood will be obtained at five different study visits for a total of 100 ml of blood over 12 weeks.

Baseline serum and plasma blood samples will be taken prior to olive oil supplementation. Follow-up blood samples will be taken at four other times points.

Serum total lipid profiles will be evaluated in the mass spectrometry core at the Maine Medical Center Research Institute (MMCRI). Additionally, inflammatory markers, including CRP, IL-6 and TNFalpha, will be determined by enzyme-linked immunosorbent assay (ELISA). Serum will be prepared by collecting 10 ml of blood into red cap tubes. Blood will be allowed to coagulate for 15-20 minutes at room temperature and then centrifuged at 1500 - 2000g, and the supernatant pipetted off and stored frozen at -65ºC. Plasma samples will be prepared from 6 ml of blood collected into 10 ml ACD (Acid Citrate Dextrose) anticoagulant tubes and processed within 1h. The white blood cell fraction will be prepared by centrifugation at 1,500-2000g for 15 minutes. The middle layer of white cells will be pipetted off and stored frozen at -60ºC. The investigators will determine the lipidomic profiles of white blood cells as well as caveolin-1 protein levels.

Lipid panels, which test total cholesterol, HDL, LDL, and triglycerides, will be run on remaining blood samples at the local laboratory. All blood testing- associated costs will be paid for with study funds from the MaineHealth Cardiology Service Line.

Other study measures: Vital signs including body weight, blood pressure and heart rate will be measured at each visit.

Subjects will maintain a study diary documenting each dose of EVOO. They will be asked to measure out 1 ounce of olive oil in a cup given to them by the study team, and consume it with bread, in a smoothie, or by drinking it plain. Compliance with EVOO consumption will be calculated from the diary (%). Study compliance will also be measured by ounces of product returned (%). Subjects receive 30 ounces of EVOO to cover 28 days, therefore, 2 ounces of returned olive oil after each study arm will be counted as 100% compliance.

Sample Size Considerations:

As this is a pilot study, the investigators utilized data available in the literature to estimate sample size. A study evaluating the effect of HDL on older age life expectancy reported a mean HDL of 47.5 with a standard deviation of 12.1 among subjects who lived to be older than 85 years. Using this estimate, and anticipating to find a 3 point difference in HDL among the two study groups, the investigators need to recruit 276 participants. However, as this is a pilot study and the investigators have limited funding, they will start by recruiting 90 subjects. With additional funding secured from a grant in the future, the study could be expanded in order to achieve the desired power of 80%.

Data Analysis:

For the purpose of this study, the investigators will attempt to detect differences in HDL and other biomarkers of cardiovascular health in subjects who consumed both low polyphenol concentration vs. high polyphenol concentration EVOO. Medical record numbers will not be included in the dataset for analysis. Descriptive statistics will be used to summarize the demographic and clinical characteristics of subjects included in the study, with continuous variables presented as a mean +- standard deviation and categorical variables as frequencies/percentages of the total. Student t tests and chi-squared tests will be conducted to compare data between the low vs. high polyphenol EVOO groups. A time series plot will be generated in order to demonstrate the change in HDL over time by level of polyphenol consumed.

Conditions

See the medical conditions and disease areas that this research is targeting or investigating.

Cardiovascular Diseases

Study Design

Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.

Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

In this study, subjects will be randomized to one of two research arms. Subjects in the first research arm will be given low polyphenol concentration EVOO, followed by high polyphenol concentration EVOO for consumption. Subjects in the second research arm will be given high polyphenol concentration EVOO, followed by low polyphenol concentration EVOO for consumption. There will be a 14- day washout period in between administration of either low or high polyphenol concentration EVOO.

Primary Study Purpose

TREATMENT

Blinding Strategy

TRIPLE

Participants Caregivers Investigators

Pharmacists will assign participants to one of the research arms following a randomization schedule, and will maintain a study log not accessible to the investigators or care provider. Study coordinators will remain blinded when distributing the bottles of EVOO.

Study Groups

Review each arm or cohort in the study, along with the interventions and objectives associated with them.

Low-to-High group

As this is a crossover study, each participant will be assigned to each treatment intervention. Participants (randomly) assigned to Arm 1 will first receive low polyphenol concentration EVOO for consumption, followed by high polyphenol concentration EVOO for consumption following a 14- day washout phase.

Group Type OTHER