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Trial registered on ANZCTR
Registration number
ACTRN12624001039572
Ethics application status
Approved
Date submitted
14/08/2024
Date registered
28/08/2024
Date last updated
28/08/2024
Date data sharing statement initially provided
28/08/2024
Type of registration
Prospectively registered
Titles & IDs
Public title
Exploring the Impact of Blueberries on Postprandial Oxidative Stress After a High-Fat High-Carbohydrate Meal in Young Healthy Men
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Scientific title
Assessing the Effect of Incorporating Freeze-Dried Blueberries in a High-Fat High-Carbohydrate Meal on Postprandial Oxidative Stress in Young Healthy Men
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Secondary ID [1]
312735
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None
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Universal Trial Number (UTN)
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Trial acronym
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
Oxidative stress
334763
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Condition category
Condition code
Metabolic and Endocrine
331321
331321
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0
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Metabolic disorders
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Diet and Nutrition
331322
331322
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0
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Other diet and nutrition disorders
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
This study is a double-blinded, 3-armed crossover, randomized postprandial trial, involving healthy male participants to make three visits to the testing facility. During each visit, participants will receive one of the following:
1. A high-fat high-carbohydrate milkshake without freeze-dried blueberries
2. A high-fat high-carbohydrate milkshake with a low dose of freeze-dried blueberries (15 g)
3. A high-fat high-carbohydrate milkshake with a high dose of freeze-dried blueberries (30 g)
On the testing visits, the participants will attend the testing facility from 9.00 am to 5.00 pm. Participants will arrive to this visit following an overnight fast after consuming regular dinner between 7.00 and 9.00 pm. Participants will also be asked to maintain their regular diet and avoid strenuous exercise for the 24 hours before the beginning of the testing session. Participants will receive reminders via text message prior to the testing session to remind them of these requirements.
During the first testing visit, participants will complete a 24-hour food recall, and have their height, weight, waist circumference, body composition, and blood pressure measured.
For all three testing visits, a cannula will be inserted into a vein in the participant's arm by a nurse or trained researcher for multiple blood draws. Blood samples will be collected during the 2 hours before and 6 hours following meal consumption. Blood samples will be collected every 60 minutes during the 2 hours before food consumption. Following a two-hour run-in period, including venous blood collection, participants are given a high-fat high-carbohydrate meal in the form of a milkshake to consume within 10 minutes (time 0). The milkshakes will contain either no blueberries, a low dose, or a high dose of freeze-dried blueberries, with commercial artificial blueberry flavoring added to maintain blinding. Adherence will be verified by recording the consumption time and through visual confirmation of the milkshake container by the independent researcher who manages the blinding. Following this, venous blood samples will be collected every 15 minutes for the first hour, every 30 minutes for the following two hours, and then every 60 minutes up to 6 hours following the meal. All blood samples will be taken by a nurse or by researchers trained in phlebotomy.
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Intervention code [1]
329258
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Prevention
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Intervention code [2]
329259
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Early detection / Screening
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Comparator / control treatment
To assess the protective effect of blueberries, the high-fat high-carbohydrate milkshake without freeze-dried blueberry will serve as the comparator.
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Control group
Active
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Outcomes
Primary outcome [1]
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Superoxide dismutase 1 protein levels in plasma
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Assessment method [1]
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ELISA method
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Timepoint [1]
339085
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Postprandial time course study with measurements taken at -120 min, -60 min, 0 min, 60 min, 120 min, 180 min, 240 min, 300 min, 360 min. There is no one time point that is the primary time point.
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Secondary outcome [1]
438495
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Plasma glucose levels
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Assessment method [1]
438495
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Thermo Fisher Indiko clinical chemistry analyser
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Timepoint [1]
438495
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Postprandial time course study with measurements taken at -60 min, 0 min, 15 min, 30 min, 45 min, 60 min, 90 min, 120 min, 150 min, 180 min.
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Secondary outcome [2]
438496
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Plasma insulin levels
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Assessment method [2]
438496
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ELISA method
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Timepoint [2]
438496
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Postprandial time course study with measurements taken at -60 min, 0 min, 15 min, 30 min, 45 min, 60 min, 90 min, 120 min, 150 min, 180 min.
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Secondary outcome [3]
438497
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Myeloperoxidase protein levels in plasma
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Assessment method [3]
438497
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ELISA method
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Timepoint [3]
438497
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Postprandial time course study with measurements taken at -120 min, -60 min, 0 min, 60 min, 120 min, 180 min, 240 min, 300 min, 360 min.
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Secondary outcome [4]
438498
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Triglyceride levels in plasma
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Assessment method [4]
438498
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Thermo Fisher Indiko clinical chemistry analyser
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Timepoint [4]
438498
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Postprandial time course study with measurements taken at -120 min, -60 min, 0 min, 60 min, 120 min, 180 min, 240 min, 300 min, 360 min.
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Secondary outcome [5]
438499
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Metabolomic profiles in plasma
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Assessment method [5]
438499
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Metabolomics using mass spectrometry
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Timepoint [5]
438499
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Postprandial time course study with measurements taken at -120 min, -60 min, 0 min, 60 min, 120 min, 180 min, 240 min, 300 min, 360 min.
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Secondary outcome [6]
438500
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Superoxide dismutase acitivty in erythrocytes
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Assessment method [6]
438500
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Colorimetric assay
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Timepoint [6]
438500
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Postprandial time course study with measurements taken at -120 min, -60 min, 0 min, 60 min, 120 min, 180 min, 240 min, 300 min, 360 min.
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Secondary outcome [7]
438563
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Peripheral Blood Mononuclear Cells (PBMCs) Transcriptomics
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Assessment method [7]
438563
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RNA sequencing
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Timepoint [7]
438563
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Postprandial time course study with measurements taken at -120 min, 0 min, 120 min, 240 min, 360 min.
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Eligibility
Key inclusion criteria
Adult men aged between 18 and 35 years
Body mass index between the range of 18.5 to 29.9 kg/m2
Non smoker and non vaper
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Minimum age
18
Years
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Maximum age
35
Years
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Sex
Males
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Can healthy volunteers participate?
Yes
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Key exclusion criteria
- Body mass index outside the range of 18.5 to 29.9 kg/m2
- Aged less than 18 or greater than 35 years
- Smoker and vaper
- Currently have chronic medical condition, such as gstrointestinal disease or autoimmune disease
- Receiving regular medication
- Dietary allergies or restrictions that prevent consuming the meals, i.e. lactose intolerant or allergies to the milkshake ingredients (milk, blueberries)
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Study design
Purpose of the study
Prevention
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Allocation to intervention
Randomised controlled trial
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Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Allocation will be concealed by using letter codes in sealed opaque envelopes.
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Simple randomization by drawing sequence from a hat
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Masking / blinding
Blinded (masking used)
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Who is / are masked / blinded?
The people receiving the treatment/s
The people administering the treatment/s
The people assessing the outcomes
The people analysing the results/data
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Intervention assignment
Crossover
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Other design features
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Phase
Not Applicable
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Type of endpoint/s
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Statistical methods / analysis
12 participants are required to show a 20% change in superoxide dismutase 1 protein levels, a biomarker of oxidative stress. 15 participants will be recruited to allow for up to 25% dropout rate.
Statistical analysis will be performed using the SPSS Statistics software. A repeated ANOVA will be conducted to determine differences in superoxide dismutase 1 protein levels between treatments. The same analysis will be applied to secondary outcomes.
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Recruitment
Recruitment status
Not yet recruiting
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Date of first participant enrolment
Anticipated
11/09/2024
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Actual
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Date of last participant enrolment
Anticipated
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Actual
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Date of last data collection
Anticipated
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Actual
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Sample size
Target
15
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Accrual to date
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Final
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Recruitment in Australia
Recruitment state(s)
VIC
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Funding & Sponsors
Funding source category [1]
317168
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University
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Name [1]
317168
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Monash University
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Address [1]
317168
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Country [1]
317168
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Australia
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Primary sponsor type
University
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Name
Monash University
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Address
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Country
Australia
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Secondary sponsor category [1]
319431
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None
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Name [1]
319431
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Address [1]
319431
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Country [1]
319431
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
315912
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Monash University Human Research Ethics Committee
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Ethics committee address [1]
315912
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https://www.monash.edu/researchoffice/ethics
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Ethics committee country [1]
315912
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Australia
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Date submitted for ethics approval [1]
315912
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11/07/2024
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Approval date [1]
315912
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31/07/2024
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Ethics approval number [1]
315912
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42966
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Summary
Brief summary
Eating ultra-processed foods high in saturated fats and refined carbohydrates, and low in essential nutrients, can disrupt the body’s natural metabolic balance over time, leading to increased metabolic stress. This stress arises because energy-dense foods challenge the body’s ability to process fats and sugars. Previous studies have shown that consuming such meals can trigger a postprandial response, as indicated by a negative correlation between postprandial glucose area under the curve (AUC) and superoxide dismutase (SOD) levels both before and after eating. Incorporating more whole foods, such as fruits, into the daily diet may help mitigate the effects of less nutritious meals. Fruits are rich in essential nutrients that can alleviate oxidative stress and promote better metabolic health. Specifically, incorporating freeze-dried blueberries into a high-fat, high-carbohydrate meal may play a protective role against oxidative stress.. This study will assess whether incorporating fruits (blueberries) into a high-fat, high-carbohydrate meal could play a protective role against postprandial oxidative stress markers induced by the meal.
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Trial website
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Trial related presentations / publications
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Public notes
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Contacts
Principal investigator
Name
136194
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Dr Aimee Dordevic
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Address
136194
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Monash University, Be Active Sleep Eat (BASE) Facility, Level 1, 264 Ferntree Gully Road, Notting Hill 3168 VIC
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Country
136194
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Australia
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Phone
136194
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+61 399024270
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Fax
136194
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Email
136194
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[email protected]
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Contact person for public queries
Name
136195
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Rafika Eviana
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Address
136195
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Monash University, Be Active Sleep Eat (BASE) Facility, Level 1, 264 Ferntree Gully Road, Notting Hill 3168 VIC
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Country
136195
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Australia
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Phone
136195
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+61 399024270
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Fax
136195
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Email
136195
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[email protected]
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Contact person for scientific queries
Name
136196
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Rafika Eviana
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Address
136196
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Monash University, Be Active Sleep Eat (BASE) Facility, Level 1, 264 Ferntree Gully Road, Notting Hill 3168 VIC
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Country
136196
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Australia
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Phone
136196
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+61 399024270
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Fax
136196
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Email
136196
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[email protected]
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Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
No
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No/undecided IPD sharing reason/comment
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What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
No additional documents have been identified.
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