Working...
ClinicalTrials.gov
ClinicalTrials.gov Menu

Post-prandial Effects of Extra Virgin Olive Oil on Endothelial Function in Adults at Risk for Type 2 Diabetes

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT04025281
Recruitment Status : Recruiting
First Posted : July 18, 2019
Last Update Posted : August 9, 2019
Sponsor:
Information provided by (Responsible Party):
Griffin Hospital

Brief Summary:

Purpose:

The number of cases of adults with Type 2 diabetes has quadrupled since 1980. This increase in the number of cases of diabetes is attributed to changes in dietary patterns, which include an increase in the consumption of obesogenic foods such as sugary foods and beverages. Patients with diabetes or at risk for diabetes are more likely to develop a cardiovascular event. Though glycemic control remains the basis of diabetes care, the co-management of atherosclerosis, hypertension and cardiovascular risk reduction, and prevention of long-term consequences are also important predictable measures to improve survival. The progression from prediabetes to Type 2 diabetes and complications of diabetes could be prevented. Lifestyle interventions (i.e., nutrition and physical activity) are the cornerstone for the primary prevention of Type 2 diabetes. Healthful eating can also improve cardio-metabolic risk factors associated with those at risk for or Type 2 diabetes. Foods that are low in fat and calories and high in fiber, with a focus on fruit, vegetables, whole grains, and the inclusion of healthful oils in their diets are typically recommended to prevent the progression from prediabetes to diabetes and complications of diabetes. Diets rich in mono- and polyunsaturated fatty acids have been shown to improve cardio-metabolic health in those at risk for or with Type 2 diabetes patients. However, the effect of olive oils on endothelial function (a surrogate marker of cardiovascular risk) in adults at risk for Type 2 diabetes is controversial. Refined olive oils lack important antioxidants and anti-inflammatory properties. Extra virgin olive oils have relatively higher levels of some minor phenolic compounds, and more naturally-occurring minerals and vitamins found in olives, that are essential to improve cardio-metabolic risk factors in those at risk for or with Type 2 diabetes. We propose a prospective, randomized, controlled crossover study to assess the post-prandial effects of extra virgin olive oil, versus post-prandial effects of a refined olive oil, on endothelial function and blood pressure in adults at risk for Type 2 diabetes.

Specific Aims To assess the post-prandial effect of extra virgin olive oil on endothelial function, measured as flow mediated dilatation, in adults at risk for Type 2 diabetes. Specifically, to demonstrate at least a 3.5% improvement in endothelial function following the consumption of a meal with 50 mL of extra virgin olive oil, compared with a meal with 50 mL of refined olive oil, in individuals at risk for Type 2 diabetes.

To assess the post-prandial effect of extra virgin olive oil on blood pressure in adults at risk for Type 2 diabetes. Specifically, to demonstrate at least 3 mmHg improvements in systolic and diastolic blood pressure after the consumption of a meal with 50 mL of extra virgin olive oil compared with a meal with 50 mL of refined olive oil, in individuals at risk for Type 2 diabetes.

Hypotheses Consumption of a meal with extra virgin olive oil compared with a meal with refined olive oil will show superior benefits in endothelial function in adults at risk for Type 2 diabetes.

Consumption of a meal with extra virgin olive oil compared with a meal with refined olive oil will show better improvement in blood pressure in adults at risk for Type 2 diabetes.


Condition or disease Intervention/treatment Phase
Type 2 Diabetes Other: Extra Virgin Olive Oil Other: Refined Olive Oil Not Applicable

Detailed Description:

Diabetes is a public health problem of epidemic proportions. According to the 2017 National Diabetes Statistics Report, 30 million people, or 9.4% of the U.S. population, are estimated to have diabetes, of which 23.1 million people are diagnosed. About 84.1 million people, or 1 in 3 people in the U.S., are estimated to have prediabetes, yet only 1 out 10 people with prediabetes is aware that they have this condition. Of those with prediabetes, 15-30% are likely to develop Type 2 diabetes within 5 years. The total medical costs and lost work and wages for people with diagnosed diabetes is about $245 billion, with the medical costs for people with diabetes being twice as high as for those without diabetes. The risk of death in individuals with diabetes is more than 50% higher than for adults without diabetes. Type 2 diabetes accounts for about 90% to 95% of all diagnosed cases of diabetes. Diabetes is the seventh leading cause of death in the U.S. Diabetes complications include cardiovascular disease (CVD), stroke, hypertension, blindness, kidney disease, nervous system damage, limb amputations, and biochemical imbalances that can cause acute life-threatening events. Rates of cardiovascular mortality are 2 to 4 times higher among adults with diabetes than among those without diabetes.

Epidemiological and cohort studies show a clear and consistent correlation of hyperglycemia with CVD. High glucose activates a pro-atherogenic phenotype in the vessel wall of endothelial cells, vascular smooth muscle cells, inflammatory cells, fibroblasts, and platelets, leading to a feed-forward atherogenic response. Diets with a low glycemic load have been reported to improve serum lipid profiles, reduce C-reactive protein (CRP) levels, and aid in weight control. In cross-sectional studies, they have been associated with higher levels of high-density lipoprotein cholesterol (HDL-C), with reduced CRP concentrations, and, in cohort studies, with decreased risk of developing diabetes and CVD. Insulin resistance may also contribute to high blood pressure, increased triglycerides and LDL cholesterol, and reduced levels of HDL cholesterol. While glycemic control remains a cornerstone of diabetes care, the co-management of hypertension, atherosclerosis, cardiovascular risk reduction, and prevention of long-term consequences are also recognized as essential to improve long-term survival.

The cornerstone of the management and prevention of Type 2 diabetes is lifestyle intervention. Prior studies have shown an association between improvement in cardio-metabolic health and diets rich in olive oils. Low glycemic index foods are typically recommended for patients with Type 2 diabetes or at risk for Type 2 diabetes. Extra virgin olive oil is a nutrient-dense food with a low glycemic index. It is rich in mono-unsaturated fatty acids that are vital to improve cardio-metabolic risk factors in those at risk for Type 2 diabetes. Among all the oils, olive oils have a relatively high content of monounsaturated fatty acids. Diets rich in mono- and polyunsaturated fatty acids have shown favorable effects on cardiovascular health, glycemic control, insulin sensitivity, and lipid profile. All olive oils, (inclusive of extra virgin olive oil), have a relatively higher amount of monounsaturated fatty acids. While refined olive oils lack important antioxidants and anti-inflammatory properties, extra virgin olive oils specifically contains relatively higher levels of some minor phenolic compounds, along with more naturally-occurring minerals and vitamins found in olives that have favorable effects on cardio-metabolic health. Therefore, the inclusion of extra virgin olive oil in the diets of adults at risk for Type 2 diabetes is likely to confer better cardio-metabolic health benefits than a refined olive oil. Some oils improve, and some impair, endothelial function. Published studies have said both about olive oils, probably because the status and caliber of the olive oils was not always specified. We therefore propose to differentiate 'good' from 'bad' olive oils, and to show that extra virgin olive oils have decisively beneficial effects, while those effects are attenuated or lost as the oil is degraded. Specifically, proposed is a randomized crossover controlled trial to assess the impact of extra virgin olive oil, as compared with refined olive oil, on endothelial function in adults at risk for Type 2 diabetes.


Layout table for study information
Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 20 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Intervention Model Description: To provide a sound basis for the statistical comparison of outcome measures for treatment assignments, participants will be randomized to 1 of 2 sequence permutations of extra virgin olive oil enriched meal and refined olive oil enriched meal. Each permutation will include a first treatment assignment, followed by a 1-week washout phase, and followed by a second treatment assignment.
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Prevention
Official Title: Post-prandial Effects of Extra Virgin Olive Oil on Endothelial Function in Adults at Risk for Type 2 Diabetes: A Randomized Crossover Controlled Trial
Actual Study Start Date : July 9, 2019
Estimated Primary Completion Date : August 31, 2019
Estimated Study Completion Date : November 30, 2019

Resource links provided by the National Library of Medicine

Drug Information available for: Olive oil

Arm Intervention/treatment
Active Comparator: Extra virgin olive oil
Participants will consume a meal prepared with 50 mL extra virgin olive oil. The meals will be prepared and provided to the study participants in the cafeteria of Griffin Hospital, where the Prevention Research Center is located. With the exception of the type of olive oil used in the meals, the meal plan will be comparable in all the intervention phases for the same individual.
Other: Extra Virgin Olive Oil
Participants will consume a meal prepared with 50 mL extra virgin olive oil. The meals will be prepared and provided to the study participants in the cafeteria of Griffin Hospital, where the Prevention Research Center is located. With the exception of the type of olive oil used in the meals, the meal plan will be comparable in all the intervention phases for the same individual.

Active Comparator: Refined olive oil
Participants will consume a meal prepared with 50 mL refined olive oil in the cafeteria of Griffin Hospital. With the exception of the olive oil used, the meal plan will be comparable in each the intervention phases for the same individual.
Other: Refined Olive Oil
Participants will consume a meal prepared with 50 mL refined olive oil in the cafeteria of Griffin Hospital. With the exception of the olive oil used, the meal plan will be comparable in each the intervention phases for the same individual.




Primary Outcome Measures :
  1. Endothelial Function (EF) Assessment [ Time Frame: 2 hours ]
    Endothelial function will be measured as Flow-mediated dilatation (FMD), that is the percent change in brachial artery diameter from pre-cuff inflation to 60-seconds post-cuff release. In addition to brachial diameter at 60 seconds post-cuff release, flow after cuff deflation within the first 15 seconds will be used as an indicator of stimulus strength, hyperemic flow being the stimulus for endothelial reactivity. To account for potential variability in stimulus strength, a secondary analysis will be performed in which FMD is divided by flow at 15 seconds post-cuff deflation to create a stimulus-adjusted response measure.


Secondary Outcome Measures :
  1. Office Blood Pressure [ Time Frame: 2 hours ]
    Systolic and diastolic BP will be measured at each visit using an approved automated device. Blood pressure will be measured (average of two measurements with five minutes between measurements) with the participant sitting in a quiet room.



Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


Layout table for eligibility information
Ages Eligible for Study:   25 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  1. Male and female age 25-75 years;
  2. non-smokers;
  3. post-menopausal females not currently on hormone replacement therapy;
  4. at risk for Type 2 diabetes as defined by meeting at least one of the criteria listed below: (a) metabolic syndrome, i.e. meet 3 out of 5 of the following criteria: (i) blood pressure >130/85 mmHg or currently taking antihypertensive medication; (ii) fasting plasma glucose (FPG) >100 mg/dL (6.1 mmol/L); (iii) serum triglycerides level (TG)>150 mg/dL (1.69 mmol/L); (iv) high-density lipoprotein (HDL) cholesterol < 40 mg/dL (1.04 mmol/L) in men, and < 50 mg/dL (1.29 mmol/L) in women; (v) overweight (body mass index, or BMI ≥25kg/m²) with waist circumference of more than 40 inches (102 cm) for men and more than 35 inches (88 cm) for women; (b) fasting blood glucose >100mg/dL and <126mg/dL or hemoglobin A1C 5.7-6.4 %.

Exclusion Criteria:

  1. failure to meet inclusion criteria;
  2. anticipated inability to complete study protocol for any reason;
  3. current eating disorder;
  4. use of insulin, glucose-sensitizing medication, vasoactive medication (including glucocorticoids, antineoplastic agents, psychoactive agents, or bronchodilators) or nutraceuticals;
  5. regular use of fiber supplements;
  6. diabetes;
  7. sleep apnea;
  8. restricted diets by choice (e.g., vegetarian, vegan);
  9. coagulopathy, known bleeding diathesis, or history of clinically significant hemorrhage, or current use of warfarin;
  10. regular exercise as defined by participating in moderate-intensity > 150 minutes/week.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04025281


Locations
Layout table for location information
United States, Connecticut
Yale-Griffin Prevention Research Center Recruiting
Derby, Connecticut, United States, 06418
Contact: Valentine Y Njike, MD, MPH    203-732-1265 ext 304    valentine.njike@yalegriffinprc.org   
Contact: Rockiy G Ayettey, MS    203 732 1265 ext 300    rockiy.ayettey@yalegriffinprc.org   
Sponsors and Collaborators
Griffin Hospital

Publications:
Centers for Disease Control and Prevention. National Diabetes Statistics Report.2017. https://www.cdc.gov/diabetes/pdfs/data/statistics/national-diabetes-statistics-report.pdf. Accessed 09/11/2018
Centers for Disease Control and Prevention. National diabetes fact sheet: national estimates and general information on diabetes and prediabetes in the United States, 2011. Available from: http://www.cdc.gov/diabetes/pubs/pdf/ndfs_2011.pdf. Accessed 09/11/2018
Nutritional Recommendations and Principles for People with Diabetes Mellitus. Diabetes Care. 1998;21(S-1):S32-S35.

Layout table for additonal information
Responsible Party: Griffin Hospital
ClinicalTrials.gov Identifier: NCT04025281     History of Changes
Other Study ID Numbers: 2018-12
First Posted: July 18, 2019    Key Record Dates
Last Update Posted: August 9, 2019
Last Verified: August 2019

Layout table for additional information
Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No

Additional relevant MeSH terms:
Layout table for MeSH terms
Diabetes Mellitus
Diabetes Mellitus, Type 2
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases