- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02479048
Avocado Fruit on Postprandial Markers of the Glycemic Response, Satiety/Appetite and Cardiometabolic Risk (AVOC1)
The Impact of Avocado Fruit on Postprandial Markers of the Glycemic Response, Satiety/Appetite and Cardiometabolic Risk: An Acute Dose Response Study
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The trial is a single center randomized, 3-arm, controlled, within-subject crossover study utilizing a multiple sampling, repeated measures paradigm. The trial will test 3 treatment conditions in 30 relatively healthy men and women 25-60 years of age. Study treatments include Control (without avocado), Test Meal 1 (1/2 avocado; ~68g), and Test Meal 2 (1 Avocado; ~136g).
Subjects will be required to meet several inclusion and exclusion criteria, which will be assessed through online and clinic mechanisms, including questionnaires, blood analysis and anthropometric measures. Eligible subjects will be invited to participate in the study. Each subject will be asked to come for one Information Session/Screening Visit, one Pre-Study Visit, three dinner pick-ups (the day before each test day visit) and three Test Day Visits. Subjects will be randomized to receive test treatments based on randomization schedule at the Pre-Study Visit.
During the Pre-Study Visit subjects will be instructed on the process for completing study questionnaires and counseled to restrict avocado intake and intake of colored plant foods rich in phytonutrients the 3 days prior to each Test Day Visit. They will be asked to restrict alcohol intake, coffee/tea/ caffeinated beverage intake and moderate / vigorous physical activity and to drink plenty of water to maintain hydration in the 24 h prior to each Test Day Visit. They will be instructed to come to the CNRC the day before each Test Day Visit to pick up their dinner meal and evening snack. Subjects will be asked to get at least 7 hours sleep and to come to the CNRC after an overnight fast of 10 h on each Test Day Visit.
Each Test Day Visit will require subjects to be in the clinic for ~7 h to complete all baseline and post challenge meal testing procedures. Subjects will be evaluated for compliance with the protocol (diet, exercise, sleep, fasting), have their body weight and blood pressure measured and baseline flow mediated dilation (FMD) will be recoded before placement of a catheter and baseline blood sample is taken. Baseline subjective satiety will be measured by visual analogue scale (VAS) just before consuming one of the 3 breakfast treatment meals. FMD will be measured at 2 time points after breakfast and blood samples and VAS questionnaires will be collected at multiple time points over the 6 h postprandial period.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Illinois
-
Chicago, Illinois, United States, 60616
- Clinical Nutrition Research Center
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Men and women aged 25-60 yrs.
- BMI of 25 - 35 kg/m2
- No clinical evidence / history of cardiovascular, respiratory, renal, gastrointestinal, or hepatic disease
- Not taking over-the-counter or prescription medications / dietary supplements that may interfere with study procedures or endpoints (e.g., antioxidant supplements, anti-inflammatory, lipid-lowering or blood pressure lowering medications.
- Fasting blood glucose of 90-115 mg/dl
- Fasting insulin < 13 U/L
- Non-smoker or past smoker (smoking cessation > 2 yrs.)
- has at least 1 large, sturdy and well anchored vein in order to place a catheter
Exclusion Criteria:
- Aged < 25 or > 60 years
- BMI < 25 kg/m2 or > 35 kg/m2
- History of cardiovascular, respiratory, renal, gastrointestinal or hepatic disease
- Diabetes
- Uncontrolled blood pressure (>140 / 90 mmHg)
- Have or had cancer other than non-melanoma skin cancer in past 5 years
- Taking over-the-counter or prescription medications or dietary supplements that may interfere with study procedures or endpoints (including protein powers, energy drinks)
- Fasting blood glucose <90 or > 115 mg/dl
- Fasting insulin ≥ 13 U/L
- Vegan dietary habits, unusual dietary habits or sensitive or allergic to any of the test meal components / ingredients
- Dislike avocados or non-consumers of avocados
- Current smoker
- Actively losing weight or trying to lose weight
- Drug or alcohol addiction
- Present with significant psychiatric or neurological disturbances
- Pregnant, lactating or planning to become pregnant
- Consuming 3 or more servings nuts or peanuts per week
- has no accessible vein site for placing a catheter
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Other
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Test meal 1 (TM1)
High fat meal (HF) with ½ avocado (~68g)
|
High fat meal (HF) with ½ avocado (~68g), matched to CM for energy content; not matched for macronutrient content or type (e.g., fat type).
|
Active Comparator: Test meal 2 (TM2)
High fat meal (HF) with 1 avocado (~136g)
|
High fat meal (HF) with 1 avocado (~136g) matched for energy but not macronutrient content or type.
|
Placebo Comparator: Control meal (CM)
High carbohydrate, high saturated fat control meal (CM) without avocado.
|
High carbohydrate, high saturated fat control meal (CM) without avocado.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in postprandial blood glucose concentration response for treatments compared to control over 6-hour postprandial period
Time Frame: Baseline to 6 hours
|
postprandial blood glucose concentration response
|
Baseline to 6 hours
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Changes in postprandial endothelial function using Flow Mediated Dilation (FMD) for treatments compared to control
Time Frame: Baseline to 6 hours
|
postprandial endothelial function using Flow Mediated Dilation (FMD)
|
Baseline to 6 hours
|
Change in postprandial blood insulin and triglycerides concentration response for treatments compared to control over 6-hour postprandial period
Time Frame: Baseline to 6 hours
|
postprandial blood insulin and triglycerides concentration response
|
Baseline to 6 hours
|
Changes in postprandial subjective satiety responses using visual analog scales (VAS) for treatments compared to control over 6-hour postprandial period
Time Frame: Baseline to 6 hours
|
postprandial subjective satiety responses using visual analog scales (VAS)
|
Baseline to 6 hours
|
Changes in postprandial gut hormones related to satiety for treatments compared to control over 6-hour postprandial period
Time Frame: Baseline to 6 hours
|
postprandial gut hormones related to satiety for treatments
|
Baseline to 6 hours
|
Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Changes in postprandial lipoproteins responses for treatments compared to control
Time Frame: Baseline to 6 hours
|
postprandial lipoproteins responses
|
Baseline to 6 hours
|
Changes in postprandial inflammation responses for treatments compared to control
Time Frame: Baseline to 6 hours
|
postprandial inflammation responses
|
Baseline to 6 hours
|
Changes in postprandial oxidation responses for treatments compared to control
Time Frame: Baseline to 6 hours
|
postprandial oxidation responses
|
Baseline to 6 hours
|
Collaborators and Investigators
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- IRB2015-001
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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