Crossover study of diets enriched with virgin olive oil, walnuts or almonds. Effects on lipids and other cardiovascular risk markers
ISRCTN | ISRCTN68210440 |
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DOI | https://doi.org/10.1186/ISRCTN68210440 |
Secondary identifying numbers | INC0706 |
- Submission date
- 08/11/2010
- Registration date
- 14/12/2010
- Last edited
- 14/12/2010
- Recruitment status
- No longer recruiting
- Overall study status
- Completed
- Condition category
- Nutritional, Metabolic, Endocrine
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data
Record updated in last year
Plain English summary of protocol
Not provided at time of registration
Contact information
Dr Emilio Ros
Scientific
Scientific
Hospital Clínic de Barcelona
C/ Villarroel 170
Barcelona
08036
Spain
Phone | +34 (0)93 2279383 |
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eros@clinic.ub.es |
Study information
Study design | Randomised crossover nutrional intervention study |
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Primary study design | Interventional |
Secondary study design | Randomised controlled trial |
Study setting(s) | Other |
Study type | Treatment |
Participant information sheet | Not available in web format, please use contact details below to request a patient information sheet |
Scientific title | Effects of diets enriched with virgin olive oil, walnuts or almonds on lipids and other cardiovascular risk markers: a randomised crossover study |
Study acronym | ONA |
Study objectives | Virgin olive oil and nuts are basic components of the Mediterranean diet, a heart-healthy dietary pattern. Nuts have well known cholesterol lowering effects, while evidence is unclear for virgin olive oil. We designed a study in hypercholesterolemic patients to assess the effects on serum lipids and other intermediate markers of cardiovascular risk of replacing 40% of the fat in the background diet with virgin olive oil, walnuts or almonds. Our hypothesis is that daily intake of virgin olive oil will be associated with low density lipoprotein (LDL) cholesterol lowering to a similar extent than walnuts and almonds consumed at similar doses as percent of total energy. |
Ethics approval(s) | The Institutional Review Board of the Hospital Clínic of Barcelona approved on the 21st March 2006 (ref: CEIC 3110-2006) |
Health condition(s) or problem(s) studied | Nutrition |
Intervention | In participants following a background Mediterranean-type isocaloric diet with similar energy, total fat and saturated fat content will be allocated to 3 random sequential periods lasting 4 weeks each in which 40% of energy (25% of fat) is replaced by virgin olive oil, walnuts or almonds. 1. Virgin olive oil is provided in 0.5 litre units sufficient to cover daily allowances of 35 to 50 g, depending on total energy requirements 2. Raw, shelled Spanish almonds (Marcona variety) provided in pre-packaged daily allowances from 50 to 75 g (almonds) 3. Spanish-grown walnuts (Serr/Chandler variety) from 40 to 65 g No washout necessary between arms because after a dietary intervention is terminated serum lipid changes stabilise in less than 3 weeks. Duration of the study for all participants is 16 weeks. |
Intervention type | Other |
Primary outcome measure | Effects of the three diets on the serum lipid profile, with LDL cholesterol changes from baseline |
Secondary outcome measures | 1. Medical records, including anthropometric measurements (height, weight and waist circumference) and blood pressure at baseline and end of each diet period 2. Food, energy and nutrient intake assessed by 7-day food records at the end of each diet period 3. Plasma fatty acid proportions (as objective measure of compliance); concentrations of noncholesterol sterols, high-sensitivity C-reactive protein, homocysteine, oxidized LDL, ICAM-1, and VCAM-1; and in vitro LDL oxidizability assay to determine lag time of conjugated diene formation at baseline and end of each diet period |
Overall study start date | 10/01/2007 |
Completion date | 15/12/2007 |
Eligibility
Participant type(s) | Patient |
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Age group | Adult |
Sex | Both |
Target number of participants | 20 |
Key inclusion criteria | 1. Asymptomatic men and women with moderate hypercholesterolemia, age 25 to 75 years (after menopause in women) 2. Serum LDL cholesterol more than 3.36 mmol/L 3. Triglycerides less than 2.82 mmol/L 4. Absence of chronic illnesses or secondary hypercholesterolemia 5. No known allergy to nuts 6. Participants can be under stable lipid-lowering drug treatment (statins or fibrates, statins at doses of no more than simvastatin 40 mg/day or equivalent) 7. Written informed consent |
Key exclusion criteria | 1. Subjects on a weight-losing diet 2. Familial hypercholesterolemia 3. Established type 2 diabetes 4. Fatty food intolerance 5. Consumption of products that can influence cholesterol metabolism (other than statins and fibrates), such as resins, ezetimibe, psyllium, fish oil concentrates, soy lecithin, or phytoestrogens |
Date of first enrolment | 10/01/2007 |
Date of final enrolment | 15/12/2007 |
Locations
Countries of recruitment
- Spain
Study participating centre
Hospital Clínic de Barcelona
Barcelona
08036
Spain
08036
Spain
Sponsor information
International Nut and Dried Fruit Foundation (Spain)
Research organisation
Research organisation
c/o Ms. Goretti Guasch
C. Boule 2, 4
Reus
43201
Spain
Phone | +34 (0)977 331 416 |
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inc@nutfruit.org | |
Website | http://www.nutfruit.org |
https://ror.org/030wfqt16 |
Funders
Funder type
Research organisation
International Nut and Dried Fruit Foundation (Spain)
No information available
Spanish Ministry of Science and Innovation (Spain) - Instituto de Salud Carlos III (CIBER Fisiopatología de la Obesidad y Nutrición [CIBERobn])
No information available
Results and Publications
Intention to publish date | |
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Individual participant data (IPD) Intention to share | No |
IPD sharing plan summary | Not provided at time of registration |
Publication and dissemination plan | Not provided at time of registration |
IPD sharing plan |