Clinical trial NCT00276939: Plant-Based Dietary Intervention in Type 2 Diabetes
Official title: Plant-Based Dietary Intervention in Type 2 Diabetes
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Diabetes Mellitus, Type 2
Keywords: Diabetes Mellitus, Type 2
Diet, Vegetarian
Diet, Fat-Restricted
Glycemic Index
Lead sponsor: Physicians Committee for Responsible Medicine
Sponsor class: OTHER
Collaborators: name: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
name: Diabetes Action Research and Education Foundation
name: George Washington University
name: University of Toronto
First posted: 2006-01-13
Enrollment: 99
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: The purpose of the study is to assess whether, in individuals with type 2 diabetes, a low-fat, vegan diet improves blood glucose control more effectively than a control diet based on current American Diabetes Association (ADA) guidelines. The principal measure is hemoglobin A1c. Cardiovascular risk factors and dietary acceptability are also assessed. The study duration is 22 weeks with a one-year follow-up.

Detailed description: Preliminary evidence suggests that low-fat, vegetarian regimens similar to those used to reverse coronary artery blockages may have a significant beneficial effect on type 2 diabetes, as demonstrated by reductions in fasting serum glucose concentrations and medication use. We therefore randomly assigned 99 individuals with type 2 diabetes to either a low-fat, vegan diet or a diet based on current American Diabetes Association guidelines for 22 weeks with a one-year follow-up period. The principal dependent measure is hemoglobin A1c. Cardiovascular risk factors are also being tracked, as is dietary acceptance.

Eligibility criteria: Inclusion Criteria:

* Diagnosis of Type 2 Diabetes Mellitus

Exclusion Criteria:

* hemoglobin A1c values \<6.5% or \>10.5%
* use of insulin for \> 5 years
* tobacco use within the preceding 6 months
* consumption of more than 2 alcoholic beverages per day
* current drug abuse
* pregnancy
* unstable medical status
* current use of a low-fat, vegetarian diet.

Primary outcomes:
measure: Hemoglobin A1c
timeFrame: 22 weeks
Secondary outcomes:
measure: Body weight
timeFrame: 22 weeks
measure: Plasma lipid concentrations
timeFrame: 22 weeks
measure: Urinary albumin
timeFrame: 22 weeks
measure: Dietary Acceptability
timeFrame: 22 weeks
Other outcomes:
Locations:
city: Washington
country: United States
facility: Physicians Committee for Responsible Medicine
state: District of Columbia
Study officials:
affiliation: Physicians Committee for Responsible Medicine
name: Neal D Barnard, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Nicholson AS, Sklar M, Barnard ND, Gore S, Sullivan R, Browning S. Toward improved management of NIDDM: A randomized, controlled, pilot intervention using a lowfat, vegetarian diet. Prev Med. 1999 Aug;29(2):87-91. doi: 10.1006/pmed.1999.0529.
citation: Barnard ND, Scialli AR, Turner-McGrievy G, Lanou AJ, Glass J. The effects of a low-fat, plant-based dietary intervention on body weight, metabolism, and insulin sensitivity. Am J Med. 2005 Sep;118(9):991-7. doi: 10.1016/j.amjmed.2005.03.039.
citation: Jenkins DJ, Kendall CW, Marchie A, Jenkins AL, Augustin LS, Ludwig DS, Barnard ND, Anderson JW. Type 2 diabetes and the vegetarian diet. Am J Clin Nutr. 2003 Sep;78(3 Suppl):610S-616S. doi: 10.1093/ajcn/78.3.610S.
citation: Barnard ND, Cohen J, Jenkins DJ, Turner-McGrievy G, Gloede L, Jaster B, Seidl K, Green AA, Talpers S. A low-fat vegan diet improves glycemic control and cardiovascular risk factors in a randomized clinical trial in individuals with type 2 diabetes. Diabetes Care. 2006 Aug;29(8):1777-83. doi: 10.2337/dc06-0606.
citation: Turner-McGrievy GM, Barnard ND, Cohen J, Jenkins DJ, Gloede L, Green AA. Changes in nutrient intake and dietary quality among participants with type 2 diabetes following a low-fat vegan diet or a conventional diabetes diet for 22 weeks. J Am Diet Assoc. 2008 Oct;108(10):1636-45. doi: 10.1016/j.jada.2008.07.015.
citation: Barnard ND, Gloede L, Cohen J, Jenkins DJ, Turner-McGrievy G, Green AA, Ferdowsian H. A low-fat vegan diet elicits greater macronutrient changes, but is comparable in adherence and acceptability, compared with a more conventional diabetes diet among individuals with type 2 diabetes. J Am Diet Assoc. 2009 Feb;109(2):263-72. doi: 10.1016/j.jada.2008.10.049.
citation: Barnard ND, Cohen J, Jenkins DJ, Turner-McGrievy G, Gloede L, Green A, Ferdowsian H. A low-fat vegan diet and a conventional diabetes diet in the treatment of type 2 diabetes: a randomized, controlled, 74-wk clinical trial. Am J Clin Nutr. 2009 May;89(5):1588S-1596S. doi: 10.3945/ajcn.2009.26736H. Epub 2009 Apr 1.
citation: Barnard ND, Noble EP, Ritchie T, Cohen J, Jenkins DJ, Turner-McGrievy G, Gloede L, Green AA, Ferdowsian H. D2 dopamine receptor Taq1A polymorphism, body weight, and dietary intake in type 2 diabetes. Nutrition. 2009 Jan;25(1):58-65. doi: 10.1016/j.nut.2008.07.012. Epub 2008 Oct 2.
citation: Turner-McGrievy GM, Jenkins DJ, Barnard ND, Cohen J, Gloede L, Green AA. Decreases in dietary glycemic index are related to weight loss among individuals following therapeutic diets for type 2 diabetes. J Nutr. 2011 Aug;141(8):1469-74. doi: 10.3945/jn.111.140921. Epub 2011 Jun 8.