Type 2 DiabetesNCT00841503
Exploring Buckwheat's Glucose Lowering Potential
An observational study of Type 2 Diabetes, run by St. Boniface Hospital at 1 site in Canada.
Trial summary
Bioactive components in buckwheat enhance insulin sensitivity in Type 2 diabetes by improving glucose uptake and utilization through a unique mechanism that operates independent of insulin. Read more about this study
- Who is it for?
- Ages 18 to 70 yearsHealthy volunteers can take part
- Conditions the study is for
- Type 2 Diabetes
- What is being tested?
- buckwheat, rice crackers, glucose, sugar substitute
- Type of treatment
- Pill or oral medicine, Injection or infusion
- How many people
- 24 participants
- Where
- 1 siteCanada
- Study dates
- Sep 2008to Mar 2012
- Phase
- Observational
- 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 18 to 70 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: A total of 24 volunteers were recruited from the community; 12 healthy volunteers and 12 volunteers with Type 2 Diabetes
Who may be able to join
- aged 18 to 70 years
- normal glycated hemoglobin (<6% healthy, <7.5% diabetic)
- absence of chronic conditions (except Type 2 diabetes)
- must be able to read and sign consent
- must be able to comply with protocol requirements
Who cannot join
- allergies to eggs, buckwheat, rice flour, or sugar substitutes (Splenda)
- acute or chronic conditions (except Type 2 diabetes)
- blood glucose >10mmol/L at beginning of test session
- medications that affect glycemic control
Trial locations and contacts
1 site in 1 country.
Canada1 site
I.H. Asper Clinical Research Institute
Winnipeg, Manitoba, R2H 2A6
About this study
Official title: A Double-Blind, Randomized, Controlled Study to Determine Buckwheat's Glucose Lowering Effects in Healthy Volunteers and Volunteers With Type 2 Diabetes
Bioactive components in buckwheat enhance insulin sensitivity in Type 2 diabetes by improving glucose uptake and utilization through a unique mechanism that operates independent of insulin.
Read the detailed description
This is a single site, double-blind, randomized, controlled study designed to explore buckwheat's glucose lowering effects in healthy volunteers and volunteers with type 2 diabetes. A total of 24 volunteers consisting of 12 volunteers (healthy and diabetic) per group for both the acute and chronic phases of testing will be recruited through advertisement from the local community.
In the acute testing phase, volunteers (healthy and diabetic) will be asked to attend 4 visits one week apart for the duration of 3 hours per visit. A fasting blood sample will be collected at each visit. At each visit, all volunteers will consume in random order 1 of the following 4 products: i) crackers containing buckwheat; ii) crackers without buckwheat); iii) 50 mls of oral solution containing glucose; or iv) 50 mls of oral solution containing the sugar substitute Splenda. The crackers will contain equal amounts of available carbohydrates. Blood sampling will occur at 15, 30, 45, 60 minutes, and then every 60 minutes for the remainder of the visit. Sampling (pre and post product consumption) will measure insulin, glucose, and various incretins. Open venous access will be secured after the first sample has been obtained to minimize the number of needle pricks. Total amount of blood obtained will not exceed 30 mls per visit.
In the chronic testing phase, volunteers (healthy and diabetic) will receive the crackers containing buckwheat for consumption each day for 7 days. Prior to food consumption, a fasting blood sample will be obtained each day and a urine sample will be collected on Days 1, 3, and 7 to assess bioavailability of buckwheat compounds (concentrations in blood and urine), insulin and glucose. Sampling for a lipid profile (total cholesterol, LDL-cholesterol, HDL-cholesterol and triglycerides), liver (ALT), kidney (creatinine), adipose function (adipokines), various incretins, as well as inflammatory status (various cytokines) will be done on Day 1 and Day 7. Total amount of blood obtained will not exceed 30 mls per visit.
- Conditions
- Type 2 Diabetes
- Being tested
- buckwheat, rice crackers, glucose, sugar substitute
- Keywords
- functional food study
- Medical subject headings
- Diabetes Mellitus, Type 2
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
buckwheat, rice crackers, glucose, sugar substituteOther
crackers contain equal amounts of available carbohydrates; 50 mls of oral solution for both glucose and Splenda
| Study group | Role | What they receive |
|---|---|---|
| 12 healthy volunteers | Healthy volunteers are randomized to 1 of 4 products over 4 weekly visits: i)buckwheat crackers;ii)crackers without buckwheat; iii)oral glucose; iv) oral sugar substitute, followed by 7 days of buckwheat crackers. Receives: Other: buckwheat, rice crackers, glucose, sugar substitute | |
| 12 Participants with Type 2 diabetes | Volunteers with type 2 diabetes are randomized to 1 of 4 products over 4 weekly visits: i)buckwheat crackers;ii)crackers without buckwheat; iii)oral glucose; iv) oral sugar substitute, followed by 7 days of buckwheat crackers. Receives: Other: buckwheat, rice crackers, glucose, sugar substitute |
What is being measured
The primary outcome is the main question the study is designed to answer.
determine glucose-lowering potential of the buckwheat bioactive compound during acute phase testing in volunteers with Type 2 diabetes
Measured: 3 hour testing
Secondary outcomes (1)
determine bioavailability of buckwheat bioactive compounds
Measured: 7 days
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted11 Feb 2009 (estimated)
- Study startSep 2008
- Primary completionMar 2012
- Study completionMar 2012
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (23)Papers the sponsor has linked to this study.
- Other trials for Type 2 DiabetesStudies 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
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 24 participants (actual)
Sponsor and investigators
- Lead sponsor
- St. Boniface Hospital
- Sponsor type
- University, hospital or other
- Collaborators
- University of Manitoba
- Responsible party
- Principal investigator, Dr.Peter Zahradka, St. Boniface Hospital
- Investigators
- Peter C Zahradka, PhD, Principal investigator, Canadian Centre for Agri-Food Research in Health & Medicine
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT00841503
- Sponsor's protocol ID
- buckwheat study
- Status last verified
- Mar 2012
- First submitted
- 10 Feb 2009
- Last updated
- 21 Mar 2012
- Results posted
- No
- Data monitoring committee
- No
Publications
Kawa JM, Taylor CG, Przybylski R. Buckwheat concentrate reduces serum glucose in streptozotocin-diabetic rats. J Agric Food Chem. 2003 Dec 3;51(25):7287-91. doi: 10.1021/jf0302153.
PubMed 14640572Qureshi AA, Sami SA, Khan FA. Effects of stabilized rice bran, its soluble and fiber fractions on blood glucose levels and serum lipid parameters in humans with diabetes mellitus Types I and II. J Nutr Biochem. 2002 Mar;13(3):175-187. doi: 10.1016/s0955-2863(01)00211-x.
PubMed 11893482Knekt P, Kumpulainen J, Jarvinen R, Rissanen H, Heliovaara M, Reunanen A, Hakulinen T, Aromaa A. Flavonoid intake and risk of chronic diseases. Am J Clin Nutr. 2002 Sep;76(3):560-8. doi: 10.1093/ajcn/76.3.560.
PubMed 12198000Thompson LU, Robb P, Serraino M, Cheung F. Mammalian lignan production from various foods. Nutr Cancer. 1991;16(1):43-52. doi: 10.1080/01635589109514139.
PubMed 1656395Larner J, Huang LC, Schwartz CF, Oswald AS, Shen TY, Kinter M, Tang GZ, Zeller K. Rat liver insulin mediator which stimulates pyruvate dehydrogenase phosphate contains galactosamine and D-chiroinositol. Biochem Biophys Res Commun. 1988 Mar 30;151(3):1416-26. doi: 10.1016/s0006-291x(88)80520-5.
PubMed 2833261Larner J, Huang LC, Suzuki S, Tang G, Zhang C, Schwartz CF, Romero G, Luttrell L, Kennington AS. Insulin mediators and the control of pyruvate dehydrogenase complex. Ann N Y Acad Sci. 1989;573:297-305. doi: 10.1111/j.1749-6632.1989.tb15006.x. No abstract available.
PubMed 2517463Varela-Nieto I, Leon Y, Caro HN. Cell signalling by inositol phosphoglycans from different species. Comp Biochem Physiol B Biochem Mol Biol. 1996 Oct;115(2):223-41. doi: 10.1016/0305-0491(96)00087-9.
PubMed 8939003Field MC. Is there evidence for phospho-oligosaccharides as insulin mediators? Glycobiology. 1997 Mar;7(2):161-8. doi: 10.1093/glycob/7.2.161-d. No abstract available.
PubMed 9134421Jones DR, Varela-Nieto I. The role of glycosyl-phosphatidylinositol in signal transduction. Int J Biochem Cell Biol. 1998 Mar;30(3):313-26. doi: 10.1016/s1357-2725(97)00144-1.
PubMed 9611774Oku A, Ueta K, Arakawa K, Ishihara T, Nawano M, Kuronuma Y, Matsumoto M, Saito A, Tsujihara K, Anai M, Asano T, Kanai Y, Endou H. T-1095, an inhibitor of renal Na+-glucose cotransporters, may provide a novel approach to treating diabetes. Diabetes. 1999 Sep;48(9):1794-800. doi: 10.2337/diabetes.48.9.1794.
PubMed 10480610Adachi T, Yasuda K, Okamoto Y, Shihara N, Oku A, Ueta K, Kitamura K, Saito A, Iwakura I, Yamada Y, Yano H, Seino Y, Tsuda K. T-1095, a renal Na+-glucose transporter inhibitor, improves hyperglycemia in streptozotocin-induced diabetic rats. Metabolism. 2000 Aug;49(8):990-5. doi: 10.1053/meta.2000.7729.
PubMed 10954015Ueta K, Ishihara T, Matsumoto Y, Oku A, Nawano M, Fujita T, Saito A, Arakawa K. Long-term treatment with the Na+-glucose cotransporter inhibitor T-1095 causes sustained improvement in hyperglycemia and prevents diabetic neuropathy in Goto-Kakizaki Rats. Life Sci. 2005 Apr 22;76(23):2655-68. doi: 10.1016/j.lfs.2004.09.038.
PubMed 15792833Nawano M, Oku A, Ueta K, Umebayashi I, Ishirahara T, Arakawa K, Saito A, Anai M, Kikuchi M, Asano T. Hyperglycemia contributes insulin resistance in hepatic and adipose tissue but not skeletal muscle of ZDF rats. Am J Physiol Endocrinol Metab. 2000 Mar;278(3):E535-43. doi: 10.1152/ajpendo.2000.278.3.E535.
PubMed 10710509Skrabanja V, Liljeberg Elmstahl HG, Kreft I, Bjorck IM. Nutritional properties of starch in buckwheat products: studies in vitro and in vivo. J Agric Food Chem. 2001 Jan;49(1):490-6. doi: 10.1021/jf000779w.
PubMed 11170616Bray GA. Evaluation of obesity. Who are the obese? Postgrad Med. 2003 Dec;114(6):19-27, 38. doi: 10.3810/pgm.2003.12.1544.
PubMed 14689721
Study at a glance
From the registry record, last updated by the sponsor on 21 Mar 2012. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Double-Blind, Randomized, Controlled Study to Determine Buckwheat's Glucose Lowering Effects in Healthy Volunteers and Volunteers With Type 2 Diabetes
- ClinicalTrials.gov ID
- NCT00841503
- Acronym / sponsor ID
- buckwheat study
- Conditions
- Type 2 Diabetes
- Keywords
- functional food study
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 24 participants (actual)
- Lead sponsor
- St. Boniface HospitalUniversity, hospital or other
- Collaborators
- University of Manitoba
- Study start
- Sep 2008
- Primary completion
- Mar 2012 (actual)
- Study completion
- Mar 2012 (actual)
- First posted
- 11 Feb 2009 (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.
Bioactive components in buckwheat enhance insulin sensitivity in Type 2 diabetes by improving glucose uptake and utilization through a unique mechanism that operates independent of insulin.
Detailed description
This is a single site, double-blind, randomized, controlled study designed to explore buckwheat's glucose lowering effects in healthy volunteers and volunteers with type 2 diabetes. A total of 24 volunteers consisting of 12 volunteers (healthy and diabetic) per group for both the acute and chronic phases of testing will be recruited through advertisement from the local community.
In the acute testing phase, volunteers (healthy and diabetic) will be asked to attend 4 visits one week apart for the duration of 3 hours per visit. A fasting blood sample will be collected at each visit. At each visit, all volunteers will consume in random order 1 of the following 4 products: i) crackers containing buckwheat; ii) crackers without buckwheat); iii) 50 mls of oral solution containing glucose; or iv) 50 mls of oral solution containing the sugar substitute Splenda. The crackers will contain equal amounts of available carbohydrates. Blood sampling will occur at 15, 30, 45, 60 minutes, and then every 60 minutes for the remainder of the visit. Sampling (pre and post product consumption) will measure insulin, glucose, and various incretins. Open venous access will be secured after the first sample has been obtained to minimize the number of needle pricks. Total amount of blood obtained will not exceed 30 mls per visit.
In the chronic testing phase, volunteers (healthy and diabetic) will receive the crackers containing buckwheat for consumption each day for 7 days. Prior to food consumption, a fasting blood sample will be obtained each day and a urine sample will be collected on Days 1, 3, and 7 to assess bioavailability of buckwheat compounds (concentrations in blood and urine), insulin and glucose. Sampling for a lipid profile (total cholesterol, LDL-cholesterol, HDL-cholesterol and triglycerides), liver (ALT), kidney (creatinine), adipose function (adipokines), various incretins, as well as inflammatory status (various cytokines) will be done on Day 1 and Day 7. Total amount of blood obtained will not exceed 30 mls per visit.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| 12 healthy volunteers | – | Other: buckwheat, rice crackers, glucose, sugar substituteHealthy volunteers are randomized to 1 of 4 products over 4 weekly visits: i)buckwheat crackers;ii)crackers without buckwheat; iii)oral glucose; iv) oral sugar substitute, followed by 7 days of buckwheat crackers. |
| 12 Participants with Type 2 diabetes | – | Other: buckwheat, rice crackers, glucose, sugar substituteVolunteers with type 2 diabetes are randomized to 1 of 4 products over 4 weekly visits: i)buckwheat crackers;ii)crackers without buckwheat; iii)oral glucose; iv) oral sugar substitute, followed by 7 days of buckwheat crackers. |
Who may qualify
- Ages
- 18 to 70 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- A total of 24 volunteers were recruited from the community; 12 healthy volunteers and 12 volunteers with Type 2 Diabetes
Key inclusion criteria (5 listed)
- aged 18 to 70 years
- normal glycated hemoglobin (<6% healthy, <7.5% diabetic)
- absence of chronic conditions (except Type 2 diabetes)
- must be able to read and sign consent
- must be able to comply with protocol requirements
Key exclusion criteria (4 listed)
- allergies to eggs, buckwheat, rice flour, or sugar substitutes (Splenda)
- acute or chronic conditions (except Type 2 diabetes)
- blood glucose >10mmol/L at beginning of test session
- medications that affect glycemic control
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 |
|---|---|---|
| buckwheat, rice crackers, glucose, sugar substitutecrackers contain equal amounts of available carbohydrates; 50 mls of oral solution for both glucose and Splenda | Other | 12 Participants with Type 2 diabetes, 12 healthy volunteers |
Primary outcome
determine glucose-lowering potential of the buckwheat bioactive compound during acute phase testing in volunteers with Type 2 diabetes
Time frame: 3 hour testing
1 secondary outcome
determine bioavailability of buckwheat bioactive compounds
Time frame: 7 days
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 Mar 2012.
- Background: PubMed 14640572Kawa JM, Taylor CG, Przybylski R. Buckwheat concentrate reduces serum glucose in streptozotocin-diabetic rats. J Agric Food Chem. 2003 Dec 3;51(25):7287-91. doi: 10.1021/jf0302153.
- Background: PubMed 11893482Qureshi AA, Sami SA, Khan FA. Effects of stabilized rice bran, its soluble and fiber fractions on blood glucose levels and serum lipid parameters in humans with diabetes mellitus Types I and II. J Nutr Biochem. 2002 Mar;13(3):175-187. doi: 10.1016/s0955-2863(01)00211-x.
- Background: PubMed 12198000Knekt P, Kumpulainen J, Jarvinen R, Rissanen H, Heliovaara M, Reunanen A, Hakulinen T, Aromaa A. Flavonoid intake and risk of chronic diseases. Am J Clin Nutr. 2002 Sep;76(3):560-8. doi: 10.1093/ajcn/76.3.560.
- Background: PubMed 1656395Thompson LU, Robb P, Serraino M, Cheung F. Mammalian lignan production from various foods. Nutr Cancer. 1991;16(1):43-52. doi: 10.1080/01635589109514139.
- Background: PubMed 2833261Larner J, Huang LC, Schwartz CF, Oswald AS, Shen TY, Kinter M, Tang GZ, Zeller K. Rat liver insulin mediator which stimulates pyruvate dehydrogenase phosphate contains galactosamine and D-chiroinositol. Biochem Biophys Res Commun. 1988 Mar 30;151(3):1416-26. doi: 10.1016/s0006-291x(88)80520-5.
- Background: PubMed 2517463Larner J, Huang LC, Suzuki S, Tang G, Zhang C, Schwartz CF, Romero G, Luttrell L, Kennington AS. Insulin mediators and the control of pyruvate dehydrogenase complex. Ann N Y Acad Sci. 1989;573:297-305. doi: 10.1111/j.1749-6632.1989.tb15006.x. No abstract available.
- Background: PubMed 8939003Varela-Nieto I, Leon Y, Caro HN. Cell signalling by inositol phosphoglycans from different species. Comp Biochem Physiol B Biochem Mol Biol. 1996 Oct;115(2):223-41. doi: 10.1016/0305-0491(96)00087-9.
- Background: PubMed 9134421Field MC. Is there evidence for phospho-oligosaccharides as insulin mediators? Glycobiology. 1997 Mar;7(2):161-8. doi: 10.1093/glycob/7.2.161-d. No abstract available.
- Background: PubMed 9611774Jones DR, Varela-Nieto I. The role of glycosyl-phosphatidylinositol in signal transduction. Int J Biochem Cell Biol. 1998 Mar;30(3):313-26. doi: 10.1016/s1357-2725(97)00144-1.
- Background: PubMed 10480610Oku A, Ueta K, Arakawa K, Ishihara T, Nawano M, Kuronuma Y, Matsumoto M, Saito A, Tsujihara K, Anai M, Asano T, Kanai Y, Endou H. T-1095, an inhibitor of renal Na+-glucose cotransporters, may provide a novel approach to treating diabetes. Diabetes. 1999 Sep;48(9):1794-800. doi: 10.2337/diabetes.48.9.1794.
- Background: PubMed 10954015Adachi T, Yasuda K, Okamoto Y, Shihara N, Oku A, Ueta K, Kitamura K, Saito A, Iwakura I, Yamada Y, Yano H, Seino Y, Tsuda K. T-1095, a renal Na+-glucose transporter inhibitor, improves hyperglycemia in streptozotocin-induced diabetic rats. Metabolism. 2000 Aug;49(8):990-5. doi: 10.1053/meta.2000.7729.
- Background: PubMed 15792833Ueta K, Ishihara T, Matsumoto Y, Oku A, Nawano M, Fujita T, Saito A, Arakawa K. Long-term treatment with the Na+-glucose cotransporter inhibitor T-1095 causes sustained improvement in hyperglycemia and prevents diabetic neuropathy in Goto-Kakizaki Rats. Life Sci. 2005 Apr 22;76(23):2655-68. doi: 10.1016/j.lfs.2004.09.038.
Related trials for Type 2 Diabetes
RecruitingObservational study
Genetics of Type 2 Diabetes in West Africans
Hypertension, Diabetes
Not yet recruitingPhase 3
A Study Comparing SHR-3167 With Insulin Degludec in Adults With Type 2 Diabetes Currently Treated With Basal Insulin
Diabetes Mellitus, Type 2
Active, not recruiting
Chrono Nutrition and Insulin Resistance in Diabetes
Diabetes Mellitus, Type 2
Not yet recruitingObservational study
Clinical Research Trial to Study Insulin Sensitivity Using Automated Glucose Clamp Technology
Obesity Type 2 Diabetes Mellitus, Obese Adults
Not yet recruitingPhase 3
A Study of Eloralintide (LY3841136) in Participants With Obesity or Overweight, Type 2 Diabetes, and Increased Cardiovascular Risk
Obesity, Overweight
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 C Zahradka, PhD principal investigator
Canadian Centre for Agri-Food Research in Health & Medicine
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Type 2 Diabetes, run by St. Boniface Hospital at 1 site in Canada.
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 4 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 Mar 2012. 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 Canada. 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?
determine glucose-lowering potential of the buckwheat bioactive compound during acute phase testing in volunteers with Type 2 diabetes (time frame: 3 hour testing). 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 NCT00841503, which also lists 23 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 21 Mar 2012.