Brain Vascular FunctionNCT05724654
Effects of Peanut Consumption on Brain Function
A study testing Skin roasted peanuts in people with Brain Vascular Function and Cerebral Blood Flow, run by Maastricht University Medical Center at 1 site in Netherlands.
Trial summary
Impaired brain vascular function precedes the development of reduced cognitive performance, while brain insulin-resistance is also associated with cognitive decline. Peanut consumption has already been shown to beneficially affect cognitive performance. Read more about this study
- Who is it for?
- Ages 60 to 75 yearsHealthy volunteers can take part
- Conditions the study is for
- Brain Vascular Function, Cerebral Blood Flow, Brain Insulin Sensitivity
- What is being tested?
- Skin roasted peanuts
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 31 participants
- Where
- 1 siteNetherlands
- Study dates
- 2 Feb 2023to 11 Jul 2024
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 60 to 75 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Men and women, aged between 60-75 years
- BMI between 20-35 kg/m2
- Fasting plasma glucose < 7.0 mmol/L
- Fasting serum total cholesterol < 8.0 mmol/L
- Fasting serum triacylglycerol < 4.5 mmol/L
- Systolic blood pressure < 160 mmHg and diastolic blood pressure < 100 mmHg
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- Stable body weight (weight gain or loss < 3 kg in the past three months)
- Willingness to give up being a blood donor from 8 weeks before the start of the study, during the study and for 4 weeks after completion of the study
- No difficult venipuncture as evidenced during the screening visit
Who cannot join
- Allergy or intolerance to peanuts
- Left-handedness
- Current smoker, or smoking cessation < 12 months
- Diabetic patients
- Familial hypercholesterolemia
- Abuse of drugs
Show all 13Show fewer
- More than 3 alcoholic consumptions per day
- Use of products or dietary supplements known to interfere with the main outcomes as judged by the principal investigators
- Use medication to treat blood pressure, lipid, or glucose metabolism
- Use of an investigational product within another biomedical intervention trial within the previous 1-month
- Severe medical conditions that might interfere with the study, such as epilepsy, asthma, kidney failure or renal insufficiency, chronic obstructive pulmonary disease, inflammatory bowel diseases, auto inflammatory diseases, and rheumatoid arthritis
- Active cardiovascular disease like congestive heart failure or cardiovascular event, such as an acute myocardial infarction or cerebrovascular accident
- Contra-indications for MRI imaging (e.g., pacemaker, surgical clips/material in body, metal splinter in eye, claustrophobia)
Trial locations and contacts
1 site in 1 country.
Netherlands1 site
Maastricht University Medical Center
Maastricht, Limburg
About this study
Official title: Longer-term Effects of Peanut Consumption on Brain Function in Older Men and Women
Impaired brain vascular function precedes the development of reduced cognitive performance, while brain insulin-resistance is also associated with cognitive decline. Peanut consumption has already been shown to beneficially affect cognitive performance. However, underlying mechanisms have not yet been established, while well-controlled trials on longer-term effects of peanuts on cognitive performance are highly needed. The hypothesis is that longer-term peanut consumption has beneficial effects on (regional) cerebral blood flow responses (primary outcome), which may relate to an improved cognitive performance (secondary outcome) in older men and women. Important objectives are to investigate in older adults the effect of 16-week peanut consumption on (i) brain vascular function in cognitive-control brain areas, and (ii) brain insulin-sensitivity. We will also focus on changes in cognitive performance as assessed with a neuropsychological test battery (secondary objective). Cerebral blood flow responses before (brain vascular function) and after the administration of intranasal insulin (brain insulin-sensitivity) will be quantified by the non-invasive gold standard magnetic resonance imaging (MRI)-perfusion method Arterial Spin Labeling (ASL).
- Conditions
- Brain Vascular Function, Cerebral Blood Flow, Brain Insulin Sensitivity, Cognitive Performance
- Being tested
- Skin roasted peanuts
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Skin roasted peanutsDietary supplement
Study volunteers will receive daily 60 g of skin roasted peanuts for 16 weeks.
| Study group | Role | What they receive |
|---|---|---|
| Experimental | Experimental | Skin roasted peanuts Receives: Dietary Supplement: Skin roasted peanuts |
| Control | No intervention | No skin roasted peanuts |
What is being measured
The primary outcome is the main question the study is designed to answer.
Brain Vascular Function
Cerebral blood flow as quantified non-invasively by the MRI perfusion method Arterial Spin Labeling (ASL)
Measured: Change in outcomes at the end of a 16-week skin roasted peanut intervention and 16-week control period.
Brain Insulin Sensitivity
Change in cerebral blood flow, as quantified non-invasively by the MRI perfusion method Arterial Spin Labeling (ASL), before and after application of intranasal insulin (160 IU)
Measured: Change in outcomes at the end of a 16-week skin roasted peanut intervention and 16-week control period.
Secondary outcomes (1)
Cognitive Performance
Cambridge Neuropsychological Test Automated Battery (CANTAB)
Measured: Change in outcomes at the end of a 16-week skin roasted peanut intervention and 16-week control period.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted13 Feb 2023
- Study start2 Feb 2023
- Primary completion11 Jul 2024
- Study completion11 Jul 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (2)Papers the sponsor has linked to this study.
- Other trials for Brain Vascular FunctionStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Crossover
- Model description
- Study participants will receive in random order daily 60 g of skin roasted peanuts (peanut intervention) or no peanuts for a total of 16 weeks (control intervention), separated by a wash-out period of at least 8 weeks.
- Masking
- Double blind
- Who is masked
- Investigator, Outcomes assessor
- Enrolment
- 31 participants (actual)
Sponsor and investigators
- Lead sponsor
- Maastricht University Medical Center
- Sponsor type
- University, hospital or other
- Collaborators
- The Peanut Institute Foundation (TPIF)
- Responsible party
- Sponsor
- Investigators
- Peter J Joris, PhD, Principal investigator, Maastricht University Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05724654
- Sponsor's protocol ID
- METC 22-046
- Status last verified
- Jul 2024
- First submitted
- 11 Jan 2023
- Last updated
- 29 Jul 2024
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Kerkhof L, Mensink RP, Plat J, Nijssen KMR, Joris PJ. Daily consumption of unsalted, skin-roasted peanuts beneficially affects regional brain insulin responsiveness in older adults: results of a longer-term randomized controlled trial. Food Funct. 2026 Oct 7. doi: 10.1039/d6fo03208g. Online ahead of print.
PubMed 42841520Kerkhof L, Mensink RP, Plat J, Nijssen KMR, Joris PJ. Longer-term skin-roasted peanut consumption improves brain vascular function and memory: A randomized, single-blind, controlled crossover trial in healthy older adults. Clin Nutr. 2025 Dec;55:170-179. doi: 10.1016/j.clnu.2025.10.020. Epub 2025 Nov 1.
PubMed 41205298
Study at a glance
From the registry record, last updated by the sponsor on 29 Jul 2024. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Longer-term Effects of Peanut Consumption on Brain Function in Older Men and Women
- ClinicalTrials.gov ID
- NCT05724654
- Acronym / sponsor ID
- METC 22-046
- Conditions
- Brain Vascular Function, Cerebral Blood Flow, Brain Insulin Sensitivity, Cognitive Performance
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 31 participants (actual)
- Lead sponsor
- Maastricht University Medical CenterUniversity, hospital or other
- Collaborators
- The Peanut Institute Foundation (TPIF)
- Study start
- 2 Feb 2023 (actual)
- Primary completion
- 11 Jul 2024 (actual)
- Study completion
- 11 Jul 2024 (actual)
- First posted
- 13 Feb 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Impaired brain vascular function precedes the development of reduced cognitive performance, while brain insulin-resistance is also associated with cognitive decline. Peanut consumption has already been shown to beneficially affect cognitive performance. However, underlying mechanisms have not yet been established, while well-controlled trials on longer-term effects of peanuts on cognitive performance are highly needed. The hypothesis is that longer-term peanut consumption has beneficial effects on (regional) cerebral blood flow responses (primary outcome), which may relate to an improved cognitive performance (secondary outcome) in older men and women. Important objectives are to investigate in older adults the effect of 16-week peanut consumption on (i) brain vascular function in cognitive-control brain areas, and (ii) brain insulin-sensitivity. We will also focus on changes in cognitive performance as assessed with a neuropsychological test battery (secondary objective). Cerebral blood flow responses before (brain vascular function) and after the administration of intranasal insulin (brain insulin-sensitivity) will be quantified by the non-invasive gold standard magnetic resonance imaging (MRI)-perfusion method Arterial Spin Labeling (ASL).
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- Double blind (investigator, outcomes assessor)
- Number of arms
- 2
- Model description
- Study participants will receive in random order daily 60 g of skin roasted peanuts (peanut intervention) or no peanuts for a total of 16 weeks (control intervention), separated by a wash-out period of at least 8 weeks.
| Arm | Type | Receives |
|---|---|---|
| Experimental | Experimental | Dietary Supplement: Skin roasted peanutsSkin roasted peanuts |
| Control | No intervention | –No skin roasted peanuts |
Who may qualify
- Ages
- 60 to 75 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (9 listed)
- Men and women, aged between 60-75 years
- BMI between 20-35 kg/m2
- Fasting plasma glucose < 7.0 mmol/L
- Fasting serum total cholesterol < 8.0 mmol/L
- Fasting serum triacylglycerol < 4.5 mmol/L
Key exclusion criteria (13 listed)
- Allergy or intolerance to peanuts
- Left-handedness
- Current smoker, or smoking cessation < 12 months
- Diabetic patients
- Familial hypercholesterolemia
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Skin roasted peanutsStudy volunteers will receive daily 60 g of skin roasted peanuts for 16 weeks. | Dietary supplement | Experimental |
Primary outcome
Brain Vascular Function
Time frame: Change in outcomes at the end of a 16-week skin roasted peanut intervention and 16-week control period.
Cerebral blood flow as quantified non-invasively by the MRI perfusion method Arterial Spin Labeling (ASL)
Brain Insulin Sensitivity
Time frame: Change in outcomes at the end of a 16-week skin roasted peanut intervention and 16-week control period.
Change in cerebral blood flow, as quantified non-invasively by the MRI perfusion method Arterial Spin Labeling (ASL), before and after application of intranasal insulin (160 IU)
1 secondary outcome
Cognitive Performance
Time frame: Change in outcomes at the end of a 16-week skin roasted peanut intervention and 16-week control period.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 Jul 2024.
- Derived from this study: PubMed 42841520Kerkhof L, Mensink RP, Plat J, Nijssen KMR, Joris PJ. Daily consumption of unsalted, skin-roasted peanuts beneficially affects regional brain insulin responsiveness in older adults: results of a longer-term randomized controlled trial. Food Funct. 2026 Oct 7. doi: 10.1039/d6fo03208g. Online ahead of print.
- Derived from this study: PubMed 41205298Kerkhof L, Mensink RP, Plat J, Nijssen KMR, Joris PJ. Longer-term skin-roasted peanut consumption improves brain vascular function and memory: A randomized, single-blind, controlled crossover trial in healthy older adults. Clin Nutr. 2025 Dec;55:170-179. doi: 10.1016/j.clnu.2025.10.020. Epub 2025 Nov 1.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Peter J Joris, PhD principal investigator
Maastricht University Medical Center
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Skin roasted peanuts in people with Brain Vascular Function and Cerebral Blood Flow, run by Maastricht University Medical Center at 1 site in Netherlands.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 9 inclusion and 13 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 29 Jul 2024. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Netherlands. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Brain Vascular Function (time frame: Change in outcomes at the end of a 16-week skin roasted peanut intervention and 16-week control period.). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05724654, which also lists 2 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 Jul 2024.