- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00626691
The Effects of Walnuts on Antioxidant Capacity and Nutritional Status in Humans
February 18, 2009 updated by: Tufts University
The goal of this study is to find out if the daily consumption of English walnuts (Juglans regia L.) for 6 wk, at a dose readily incorporated into the diet (0.75 or 1.50 oz), will have a positive effect on antioxidant capacity and nutrient status in a population of healthy adults, aged 50-70 y.
Study Overview
Detailed Description
Epidemiological studies conducted in large populations have consistently shown that increased consumption of plant-based, antioxidant-rich foods, i.e., fruits, vegetables, grains, and nuts, reduces the risk for several chronic diseases.
Among the various plants consumed worldwide, English walnuts (Juglans regia L.) have been reported to have the highest antioxidant activity, second only to rosehips (Rosa canina L.).
There are a number of different compounds present in walnuts that are known to exhibit antioxidant activity, including vitamin E (as γ-tocopherol), melatonin, and several non-flavonoid polyphenols (e.g., ellagic acid monomers and polymeric ellagitannins).
In vitro and ex vivo, studies have demonstrated the ability of walnuts and walnut extracts to increase the resistance of low density lipoprotein (LDL) to oxidation.
Walnuts and/or their constituents have also been shown to decrease levels of oxidative stress in diabetic mice and increase serum antioxidant capacity in rats2.
In humans, in vivo antioxidant capacity changes after consuming walnuts have only been measured in subjects with Type 2 diabetes.
The antioxidant capacity of the lipophilic compartments, as well as the cooperative/synergistic interactions between the water- and fat-soluble antioxidants present in plasma after walnut consumption have not been measured.
Indeed, there have been no studies conducted to date of the effect of walnut consumption on the total antioxidant capacity of healthy men and women.
The goal of our proposed study is to determine if consuming walnuts in amounts readily incorporated into the diet can affect the antioxidant capacity of older adults.
Study Type
Interventional
Enrollment (Actual)
24
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
Massachusetts
-
Boston, Massachusetts, United States, 02111
- Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
50 years and older (Adult, Older Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Generally healthy men and postmenopausal women age 50 or over
- BMI 18.5-35 kg/m2
Exclusion Criteria:
- Cigarette smoking and/or nicotine replacement use
- History or known allergy to nuts of any kind
- Regular consumption of ≥ 5 oz nuts/week for 6 weeks prior to study admission
- Individuals taking estrogen
- Use of cholesterol-lowering medications
- Gastrointestinal disease
- Kidney disease
- Endocrine disease: including diabetes, untreated thyroid disease
- Rheumatoid arthritis
- Active treatment for any type of cancer, except basal cell carcinoma, within 1 year prior to study admission
- Systolic blood pressure > 150 mmHg and/or diastolic blood pressure > 95 mmHg
- Regular use of oral steroids
- Regular daily intake of ≥ 2 alcoholic drinks
- Illicit drug use
- No fish oil supplements (including cod liver oil) for 6 weeks prior to study admission
- No high dose (≥ 3X RDA) supplements of vitamins C, E, selenium, or beta-carotene for one month prior to study admission
- No dietary supplements containing phenolic compounds, i.e., herbal preparations, or berry containing preparations (such as cranberry capsules) for one month prior to study admission
- No regular consumption of pomegranate juice (≥ 180 mL or 6 oz/d, ≥ 3 times/wk) for one month prior to study admission
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: None (Open Label)
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Nutritional status and antioxidant capacity
Time Frame: 5 months
|
5 months
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: Diane L McKay, PhD, Tufts Medical Center
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
February 1, 2007
Primary Completion (Actual)
December 1, 2007
Study Completion (Actual)
December 1, 2007
Study Registration Dates
First Submitted
February 20, 2008
First Submitted That Met QC Criteria
February 28, 2008
First Posted (Estimate)
February 29, 2008
Study Record Updates
Last Update Posted (Estimate)
February 19, 2009
Last Update Submitted That Met QC Criteria
February 18, 2009
Last Verified
February 1, 2009
More Information
Terms related to this study
Other Study ID Numbers
- PV2707
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
product manufactured in and exported from the U.S.
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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