Bioavailability of virgin olive oil bioactive compounds and medium term impact on biomarkers of health
| ISRCTN | ISRCTN93136746 |
|---|---|
| DOI | https://doi.org/10.1186/ISRCTN93136746 |
| Protocol serial number | 2012071 |
| Sponsor | University of Glasgow (UK) |
| Funder | University of Lisbon, in collaboration with the Sovena company (Portugal) |
- Submission date
- 02/06/2014
- Registration date
- 09/07/2014
- Last edited
- 19/02/2015
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Nutritional, Metabolic, Endocrine
Plain English summary of protocol
Background and study aims
Virgin olive oil is widely used in Mediterranean food and has been associated with health benefits such as protection against heart disease. For many years, the beneficial properties of olive oil were attributed to a type of fat named oleic acid. Besides containing high quantities of oleic acid, some olive oils contain small molecules called phenolic compounds, which are known as natural antioxidants. Little is known about the fate of these compounds in the body once they are consumed, or where they do to influence health. This study aims to find out the contribution of phenolic compounds present in virgin olive oil to the prevention of diseases and promotion of health using new biomarker techniques (a biomarker is a small molecule acting as a reporter for health and disease).
Who can participate?
Healthy adults, aged 18-75, who are not allergic to olive products.
What does the study involve?
Your body weight, height, waist circumference and blood pressure will be recorded and you will fill in a questionnaire to help us establish your intake of foods rich in phenolic compounds. During the 6-week study period, you will be randomly allocated to take a daily dose of olive oil (20 ml) with either a high or low polyphenolic content, to be consumed uncooked. At the beginning, middle and end of the study, participants will be asked to keep a record of the food eaten the day before the visit, to collect a spot urine sample in a small tube (second urine of the day) and to provide a blood sample. We will measure, in urine and blood, the levels of small molecules (biomarkers) that are related to heart and kidney health, as well as the way food is digested, transformed in the body and excreted.
What are the possible benefits and risks of participating?
There are no benefits or risks associated with taking part in the trial.
Where is the study run from?
Not provided at time of registration.
When is the study starting and how long is it expected to run for?
The study started in July 2012 and ran for 6 weeks.
Who is funding the study?
University of Lisbon (Portugal).
Who is the main contact?
Dr William Mullen
william.mullen@glasgow.ac.uk
Contact information
Scientific
Institute of Cardiovascular and Medical Sciences
Joseph Black Building
University of Glasgow
Glasgow
G12 8QQ
United Kingdom
Study information
| Primary study design | Interventional |
|---|---|
| Study design | Double-blind parallel supplementation study with low and high polyphenolic olive oil |
| Secondary study design | Randomised controlled trial |
| Study type | Participant information sheet |
| Scientific title | Bioavailability of virgin olive oil bioactive compounds and impact of a 6-week supplementation on biomarkers of coronary artery disease, chronic kidney disease or diabetes |
| Study objectives | Can a 6-week supplemetation of olive oil with either a high or low polyphenolic content alter proteomic biomarkers of coronary artery disease, chronic kidney disease or diabetes? |
| Ethics approval(s) | Ethics committee of the University of Glasgow, College of Medical, Veterinary and Life Sciences, 31/08/2012, ref. 2012071. |
| Health condition(s) or problem(s) studied | Risk of coronary artery disease, chronic kidney disease and diabetes |
| Intervention | 66 healthy volunteers will be randomly allocated into one of two groups and asked to consume 20 ml of olive oil per day for 6 weeks. Group 1 will be given olive oil with a high polyphenolic content. Group 2 will be given olive oil with a low polyphenolic content. Blood and urine samples will be collected the day before the study starts and also after 3 weeks and at the end of the study. Blood pressure and weight will be recorded at these visits too. |
| Intervention type | Other |
| Primary outcome measure(s) |
Proteomic urinary biomarkers of coronary artery disease, chronic kidney disease and diabetes. These will be measured after 3 weeks, the mid point and after 6 weeks, the end of the study. |
| Key secondary outcome measure(s) |
Plasma-based biomarkers of heart disease and blood pressure. These will be measured after 3 weeks, the mid point and after 6 weeks, the end of the study. |
| Completion date | 31/08/2012 |
Eligibility
| Participant type(s) | Patient |
|---|---|
| Age group | Adult |
| Lower age limit | 18 Years |
| Upper age limit | 75 Years |
| Sex | All |
| Target sample size at registration | 66 |
| Key inclusion criteria | Healthy adults, aged 18-75 years |
| Key exclusion criteria | 1. Those allergic to olive products 2. Currently taking medication (other than the contraceptive pill) 3. Have taken antibiotics in the last 3 months 4. Have received or are receiving treatments for any chronic gut disease 5. Is pregnant, trying to conceive, or lactating |
| Date of first enrolment | 01/07/2012 |
| Date of final enrolment | 31/08/2012 |
Locations
Countries of recruitment
- United Kingdom
- Scotland
Study participating centre
G12 8QQ
United Kingdom
Results and Publications
| Individual participant data (IPD) Intention to share | No |
|---|---|
| IPD sharing plan summary | Not provided at time of registration |
| IPD sharing plan |
Study outputs
| Output type | Details | Date created | Date added | Peer reviewed? | Patient-facing? |
|---|---|---|---|---|---|
| Results article | results | 01/01/2015 | Yes | No | |
| Participant information sheet | Participant information sheet | 11/11/2025 | 11/11/2025 | No | Yes |
