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Study of Oral Anthocyanins on Insulin Resistance

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ClinicalTrials.gov Identifier: NCT01180712
Recruitment Status : Completed
First Posted : August 12, 2010
Last Update Posted : August 2, 2019
Sponsor:
Information provided by (Responsible Party):
University of Aberdeen

Brief Summary:

Dietary strategies for alleviating the metabolic complications such as diabetes associated with obesity are actively being pursued as alternatives to pharmaceutical interventions The genus Vaccinium (e.g. blueberry, blaeberry, cranberry) has been used traditionally as a source of folk remedies for established diabetic symptoms, primarily as leaf or stem infusions or decoctions. Berries from this family such as blaeberry (BL) and blueberry (BB) are enriched in anthocyanins, polyphenolics recognized for their ability to provide and activate cellular antioxidant protection, inhibit inflammatory gene expression, and consequently protect against oxidant-induced and inflammatory cell damage and cytotoxicity. The association of obesity with adipose tissue stress, macrophage recruitment, and inflammatory gene expression suggests that eating edible berries from this genus might provide an effective alternative or supplementary intervention to attenuate obesity- associated inflammation and the associated insulin resistance.

The aim of this study is to determine the effects of anthocyanin supplementation in the form of a concentrated blaeberry extract on insulin resistance and inflammation particularly in the adipose tissue following a three week supplementation period.


Condition or disease Intervention/treatment Phase
Type 2 Diabetes Dietary Supplement: Mirtoselect Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 16 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Study of Oral Anthocyanins on Insulin Resistance
Study Start Date : June 2010
Actual Primary Completion Date : May 2019
Actual Study Completion Date : May 2019

Resource links provided by the National Library of Medicine


Arm Intervention/treatment
Active Comparator: Blaeberry concentrated caspule

30 obese male subjects (BMI > 30) with type 2 diabetes controlling their diabetes by diet alone or impaired glucose tolerance.

Volunteers will be given a total daily dose of 1.4 grams of mirtoselect (a concentrated blaeberry extract) a day formulated in hard gelatin capsules (0.47 gram per capsule) administered thrice a day for 21 days.

Mirtoselect provided by Indena S.p.A. (http://www.mirtoselect.info/)

Dietary Supplement: Mirtoselect

Male subjects (BMI > 30) with type 2 diabetes controlling their diabetes by diet alone or impaired glucose tolerance.

Volunteers will be given either a total daily dose of 1.4 grams of concentrated blaeberry extract (mirtoselect provided by Indena S.p.A. (http://www.mirtoselect.info/) in a hard gelatin capsules or control capsules containing lactose administered thrice a day for 21 days.


Placebo Comparator: Placebo capsules containing lactose

30 obese male subjects (BMI > 30) with type 2 diabetes controlling their diabetes by diet alone or impaired glucose tolerance.

Volunteers will be given a placebo consisting of lactose formulated in hard gelatin capsules administered thrice a day for 21 days.

Dietary Supplement: Mirtoselect

Male subjects (BMI > 30) with type 2 diabetes controlling their diabetes by diet alone or impaired glucose tolerance.

Volunteers will be given either a total daily dose of 1.4 grams of concentrated blaeberry extract (mirtoselect provided by Indena S.p.A. (http://www.mirtoselect.info/) in a hard gelatin capsules or control capsules containing lactose administered thrice a day for 21 days.





Primary Outcome Measures :
  1. Oral Glucose Tolerance Test [ Time Frame: Day 0 and 21 days post intervention ]
    Change in Oral Glucose Tolerance following intervention


Secondary Outcome Measures :
  1. Fasting blood glucose/insulin [ Time Frame: Day 0, 7, 14, and 21 days post intervention ]
    Change in fasting blood glucose/insulin in response to intervention



Information from the National Library of Medicine

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Ages Eligible for Study:   40 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Obese male subjects (BMI > 30)
  • Aged > 40 and < 70 years of age
  • Type 2 diabetes; subjects controlling their diabetes by diet alone or with impaired glucose tolerance
  • All the obese subjects will have a waist circumference over 40 inches
  • All subjects must live the Aberdeenshire area of Scotland

Exclusion Criteria:

Medical exclusion criteria:

  • Chronic illness, including:

    • thromboembolic or coagulation disease,
    • unregulated thyroid disease,
    • kidney disease,
    • hepatic disease,
    • severe gastrointestinal disorders,
    • pulmonary disease (e.g. chronic bronchitis, COPD),
  • Alcohol or any other substance abuse,
  • Eating disorders,
  • Psychiatric disorders (including severe depression, lithium treatment, schizophrenia, severe behavioural disorders),
  • Skin conditions on the abdomen,
  • Allergy to skin dressings,

Medication exclusion criteria:

  • Oral steroids,
  • Tricyclic antidepressants, neuroleptics,
  • Anticoagulants,
  • Digoxin and antiarrhythmics,
  • Chronic use of antiinflammatories (e.g. high doses of aspirin, ibuprofen),
  • Insulin, Sulphonylureas, Thiazolidinediones (glitazones), metformin

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01180712


Locations
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United Kingdom
University of Aberdeen Rowett Institute of Nutrition and Health
Aberdeen, United Kingdom, AB21 9SB
Sponsors and Collaborators
University of Aberdeen
Investigators
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Principal Investigator: Nigel Hoggard, PhD University of Aberdeen Rowett Institute of Nutrition and Health
  Study Documents (Full-Text)

Documents provided by University of Aberdeen:
Publications:
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Responsible Party: University of Aberdeen
ClinicalTrials.gov Identifier: NCT01180712    
Other Study ID Numbers: REC 10/S0802/27
Rowett 901 ( Other Identifier: Rowett institute study code )
First Posted: August 12, 2010    Key Record Dates
Last Update Posted: August 2, 2019
Last Verified: August 2019
Keywords provided by University of Aberdeen:
anthocyanin
blaeberries
bilberries
blueberries
mirtoselect
type 2 diabetes
insulin resistance
Adipose tissue
inflammation
Additional relevant MeSH terms:
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Diabetes Mellitus, Type 2
Insulin Resistance
Diabetes Mellitus
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases
Hyperinsulinism