PrediabetesNCT02203240
Cocoa and Metabolic Health in Prediabetes
A study testing Cocoa in people with Prediabetes, run by Virginia Polytechnic Institute and State University at 1 site in United States.
Trial summary
The purpose of this study is to determine the impact of consuming cocoa on blood glucose levels, glucose metabolism, and other markers of pre-diabetes in overweight and/or obese individuals. Read more about this study
- Who is it for?
- Ages 40 to 75 years
- Conditions the study is for
- Prediabetes
- What is being tested?
- Cocoa
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 16 participants
- Where
- 1 siteUnited States
- Study dates
- Jun 2014to May 2016
- 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 40 to 75 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Body Mass Index (BMI) greater than or equal to 25 and less than 40.
- Have at least one of the following: 1) impaired fasting glucose (IFG) after an overnight fast with plasma glucose concentration between 100-125 mg/dl, 2) impaired glucose tolerance (IGT) as identified by the standard Oral Glucose Tolerance Test (OGTT) with 2 hour plasma glucose concentration between 140-200 mg/dl following 75 g glucose OGTT, 3) HbA1c levels between 5.7-6.4% or 4) considered at risk to developing type 2 diabetes by the American Diabetes Association risk assessment. If subjects are above the prediabetic range for any of these tests (indicating they may be type 2 diabetic), they will be excluded and referred to their physician.
- Weight stable (+/-2 kg) for the last 6 months.
- Sedentary to recreationally active (less than 2 d/wk, 20 min/d).
- Have a blood pressure that is less than 160/100 mmHg, total cholesterol that is less than 300 mg/dl and a triglyceride concentration of less than 450 mg/dl.
Who cannot join
- Past or current history of coronary heart disease, stroke or major cardiovascular disease events, respiratory diseases, endocrine or metabolic diseases (including type 1 and type 2 diabetes), inflammatory bowel disease, cancer, or neurological or hematological disorders that would compromise the study or the health of the subject.
- Past or current history of gastrointestinal disorders (including lactose intolerance, ulcers, cancer (stomach, intestinal, colon, pancreatic, liver, etc) NASH, NAFLD, cirrhosis, IBD/IBS, celiac disease, etc).
- Current use of any medication including but not limited to cholesterol lowering medication (including fibric acid derivatives and niacin), antibiotics, immunosuppressive drugs, azole antifungals, non-steroidal anti-inflammatory drugs (NSAIDs), hormone replacement therapy or antioxidants/supplements.
- Use of antibiotics, prebiotics, or probiotics within the prior 3 months.
- Smoking or other tobacco use
- Habitual consumption of alcohol more than 2 servings/d for males and 1 serving/d for females.
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- Strict vegetarians or vegans, or strong aversions to major food groups that may be part of the controlled diet.
- Recent surgery
- History of alcohol or drug abuse.
- Pregnant or plan to become pregnant
- Allergic to either lidocaine or bupivacaine
Trial locations and contacts
1 site in 1 country.
United States1 site
Human Integrative Physiology Laboratory
Blacksburg, Virginia, 24061
About this study
Official title: Dietary Cocoa for Inhibition of Metabolic Endotoxemia and Glucose Intolerance
The purpose of this study is to determine the impact of consuming cocoa on blood glucose levels, glucose metabolism, and other markers of pre-diabetes in overweight and/or obese individuals. Our hypothesis is that consumption of cocoa improves insulin sensitivity and glucose metabolism in subjects at risk for developing type-2 diabetes.
- Conditions
- Prediabetes
- Being tested
- Cocoa, Placebo
- Keywords
- Cacao, Polyphenols, Prediabetic State, Blood Glucose, Glucose Intolerance, Diabetes Mellitus, Type 2, Obesity, Muscle, Skeletal, Endotoxins, Gut Permeability, Incretins, Metabolic Flexibility
- Medical subject headings
- Prediabetic State, Glucose Intolerance, Diabetes Mellitus, Type 2, Obesity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
CocoaOther
PlaceboOther
| Study group | Role | What they receive |
|---|---|---|
| Cocoa | Experimental | 3 servings of polyphenol-rich cocoa beverage consumed per day. Receives: Other: Cocoa |
| Placebo | Placebo comparator | 3 servings of non-cocoa beverage consumed per day. Receives: Other: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in insulin sensitivity
Insulin sensitivity will be determined using Bergman's minimal model (MINMOD Millennium software) via a frequently sampled intravenous glucose tolerance test (IVGTT). Fasting baseline blood samples will be taken prior to the dextrose injection (0.3 g/kg; 50% solution) at minute 0. Venous samples will be collected at minutes 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, and 18. Insulin (0.025 U/kg) will be injected at minute 20. Venous sampling will continue at minutes 22, 23, 24, 25, 27, 30, 40, 50, 60, 70, 80, 90, 100, 120, 150, and 180. Glucose concentration will be immediately analyzed an automated glucose oxidase analyzer. Insulin will be later measured from serum using the Immulite 1000 immunoassay analyzer.
Measured: Baseline and 4 weeks
Secondary outcomes (5)
Change in blood glucose response to a mixed meal
The test meal will be 2-8 oz. servings of a meal replacement beverage providing a mixed macronutrient profile, supplemented with either a cocoa beverage dry mix (10 g cocoa) or a calorie-matched placebo beverage mix (0 g cocoa). Blood samples will be taken at baseline and subsequently 1, 2, 3, and 4 hours after the first sip of the test beverage. Plasma glucose concentrations will be analyzed immediately using a glucose auto-analyzer (Yellow Springs Instruments).
Measured: Baseline and 1 week
Change in hormone secretion response to a mixed meal
Serum insulin, GLP-1, GIP, and C-peptide concentrations will be determined using commercially available enzyme-linked immunosorbent assay (ELISA) kits from the blood samples drawn at baseline, 1, 2, 3, and 4 hours during the mixed meal challenge.
Measured: Baseline and 1 week
Change in skeletal muscle metabolic flexibility
Subjects will consume a high fat meal containing 820 kcal; 52 g total carbohydrates, 24 g protein, and 58 g fat. During the high fat challenge session, two skeletal muscle biopsies will be conducted on alternate legs; one before the high fat meal and one 4 hours later. Biopsies of the vastus lateralis will be performed using a 5 mm modified Bergström needle. Collected tissue will be washed in 0.9% sterile saline to remove blood and tissue. Samples will be weighed and added to buffer and placed on ice for immediate analysis of substrate flexibility. For substrate flexibility, pyruvate oxidation will be used to assess the activity of pyruvate dehydrogenase. Calculated metabolic flexibility is expressed as a ratio of pyruvate oxidation to pyruvate oxidation + free fatty acids.
Measured: Baseline and 4 weeks
Change in blood endotoxin levels
During the high fat challenge (see Outcome 4), blood samples will be collected at baseline and 1, 2, 3, and 4 h after the first bite of the meal. Serum endotoxin will be measured in duplicate using Limulus Amebocyte Lysate Pyrogent ® 5000 assay kits.
Measured: Baseline and 4 weeks
Change in gut permeability
The four-sugar [40 g sucrose, 1 g mannitol, 1 g sucralose and 5 g lactulose] probe test will be used to assess total gut permeability. After an overnight fast and urine evacuation, participants will be asked to consume the sugar-probe beverage within 5 minutes. They will be given two breakfast sandwiches to consume immediately. Participants will be instructed to collect all of their urine in a provided container from the time the beverage was consumed (0 h) until 5 h. A second urine collection container will be filled between 6-24 h. Twenty-four hours later, the volume of urine in each container will be measured and aliquots collected for later analysis. Gastroduodenal permeability is defined as sucrose/mannitol ratio (0-5 h). Small intestinal permeability is defined as the calculated lactulose/mannitol ratio for 0-5 samples. Colonic permeability is defined as both the 6-24 h lactulose/mannitol ratio and 6-24 h sucralose/mannitol ratio.
Measured: Baseline and 4 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted29 Jul 2014 (estimated)
- Study startJun 2014
- Primary completionDec 2015
- Study completionMay 2016
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for PrediabetesStudies 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
- Parallel groups
- Masking
- Double blind
- Who is masked
- Participant, Investigator
- Enrolment
- 16 participants (actual)
Sponsor and investigators
- Lead sponsor
- Virginia Polytechnic Institute and State University
- Sponsor type
- University, hospital or other
- Collaborators
- The Hershey Company
- Responsible party
- Principal investigator, Andrew P. Neilson, Virginia Polytechnic Institute and State University
- Investigators
- Andrew P Neilson, PhD, Principal investigator, Virginia Polytechnic Institute and State University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02203240
- Sponsor's protocol ID
- VT13261005
- Status last verified
- Sep 2023
- First submitted
- 26 Jul 2014
- Last updated
- 21 Sep 2023
- Results posted
- No
- Data monitoring committee
- No
Study at a glance
From the registry record, last updated by the sponsor on 21 Sep 2023. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Dietary Cocoa for Inhibition of Metabolic Endotoxemia and Glucose Intolerance
- ClinicalTrials.gov ID
- NCT02203240
- Acronym / sponsor ID
- VT13261005
- Conditions
- Prediabetes
- Keywords
- Cacao, Polyphenols, Prediabetic State, Blood Glucose, Glucose Intolerance, Diabetes Mellitus, Type 2, Obesity, Muscle, Skeletal
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 16 participants (actual)
- Lead sponsor
- Virginia Polytechnic Institute and State UniversityUniversity, hospital or other
- Collaborators
- The Hershey Company
- Study start
- Jun 2014
- Primary completion
- Dec 2015 (actual)
- Study completion
- May 2016 (actual)
- First posted
- 29 Jul 2014 (estimated)
- 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.
The purpose of this study is to determine the impact of consuming cocoa on blood glucose levels, glucose metabolism, and other markers of pre-diabetes in overweight and/or obese individuals. Our hypothesis is that consumption of cocoa improves insulin sensitivity and glucose metabolism in subjects at risk for developing type-2 diabetes.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, investigator)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Cocoa | Experimental | Other: Cocoa3 servings of polyphenol-rich cocoa beverage consumed per day. |
| Placebo | Placebo comparator | Other: Placebo3 servings of non-cocoa beverage consumed per day. |
Who may qualify
- Ages
- 40 to 75 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (5 listed)
- Body Mass Index (BMI) greater than or equal to 25 and less than 40.
- Have at least one of the following: 1) impaired fasting glucose (IFG) after an overnight fast with plasma glucose concentration between 100-125 mg/dl, 2) impaired glucose tolerance (IGT) as identified by the standard Oral Glucose Tolerance Test (OGTT) with 2 hour plasma glucose concentration between 140-200 mg/dl following 75 g glucose OGTT, 3) HbA1c levels between 5.7-6.4% or 4) considered at risk to developing type 2 diabetes by the American Diabetes Association risk assessment. If subjects are above the prediabetic range for any of these tests (indicating they may be type 2 diabetic), they will be excluded and referred to their physician.
- Weight stable (+/-2 kg) for the last 6 months.
- Sedentary to recreationally active (less than 2 d/wk, 20 min/d).
- Have a blood pressure that is less than 160/100 mmHg, total cholesterol that is less than 300 mg/dl and a triglyceride concentration of less than 450 mg/dl.
Key exclusion criteria (11 listed)
- Past or current history of coronary heart disease, stroke or major cardiovascular disease events, respiratory diseases, endocrine or metabolic diseases (including type 1 and type 2 diabetes), inflammatory bowel disease, cancer, or neurological or hematological disorders that would compromise the study or the health of the subject.
- Past or current history of gastrointestinal disorders (including lactose intolerance, ulcers, cancer (stomach, intestinal, colon, pancreatic, liver, etc) NASH, NAFLD, cirrhosis, IBD/IBS, celiac disease, etc).
- Current use of any medication including but not limited to cholesterol lowering medication (including fibric acid derivatives and niacin), antibiotics, immunosuppressive drugs, azole antifungals, non-steroidal anti-inflammatory drugs (NSAIDs), hormone replacement therapy or antioxidants/supplements.
- Use of antibiotics, prebiotics, or probiotics within the prior 3 months.
- Smoking or other tobacco use
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 |
|---|---|---|
| Cocoa | Other | Cocoa |
| Placebo | Other | Placebo |
Primary outcome
Change in insulin sensitivity
Time frame: Baseline and 4 weeks
Insulin sensitivity will be determined using Bergman's minimal model (MINMOD Millennium software) via a frequently sampled intravenous glucose tolerance test (IVGTT). Fasting baseline blood samples will be taken prior to the dextrose injection (0.3 g/kg; 50% solution) at minute 0. Venous samples will be collected at minutes 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, and 18. Insulin (0.025 U/kg) will be injected at minute 20. Venous sampling will continue at minutes 22, 23, 24, 25, 27, 30, 40, 50, 60, 70, 80, 90, 100, 120, 150, and 180. Glucose concentration will be immediately analyzed an automated glucose oxidase analyzer. Insulin will be later measured from serum using the Immulite 1000 immunoassay analyzer.
5 secondary outcomes
Change in blood glucose response to a mixed meal
Time frame: Baseline and 1 week
Change in hormone secretion response to a mixed meal
Time frame: Baseline and 1 week
Change in skeletal muscle metabolic flexibility
Time frame: Baseline and 4 weeks
Change in blood endotoxin levels
Time frame: Baseline and 4 weeks
Change in gut permeability
Time frame: Baseline and 4 weeks
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 21 Sep 2023.
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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.
Andrew P Neilson, PhD principal investigator
Virginia Polytechnic Institute and State University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Cocoa in people with Prediabetes, run by Virginia Polytechnic Institute and State University at 1 site in United States.
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 5 inclusion and 11 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 21 Sep 2023. 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 United States. 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. Some participants in this study may receive a placebo. 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?
Change in insulin sensitivity (time frame: Baseline and 4 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 21 Sep 2023.