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Glycemic Response of Bean-and-rice Meals in Type 2 Diabetes Mellitus

This study has been completed.
United States Dry Bean Council
Information provided by:
Arizona State University Identifier:
First received: October 27, 2010
Last updated: November 12, 2010
Last verified: November 2010

The study uses a randomized, placebo-controlled experimental design consisting of 4 different test treatments matched on carbohydrate (CHO) content. The three beans are similar in their CHO content amount for ½ cup at ~20 grams CHO. Each of the bean varieties will be served in a ~½ cup serving size with ~ ½ cup of plain steamed white rice (30 grams CHO) for a total of 50 grams of CHO per meal for each of the three test treatments. The 4th placebo or control treatment consists of ~ 7/8 cup of rice alone, an amount consistent with the CHO content of the test meals. Most diabetic meal plans recommend no more than 45-60 grams of CHO per meal. Fifty grams of CHO is a standard amount for glycemic response testing in general.

The investigators hypotheses were:

  • The test meals containing the three bean types in combination with white rice will decrease the participants' glycemic response when eaten as part of a meal.
  • The reduction in post-prandial glycemia will not differ between bean types in the elicited responses among individuals with type 2 diabetes.

Condition Intervention Phase
Blood Glucose
Type 2 Diabetes Mellitus
Other: Whole cooked beans with rice meals
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Open Label
Primary Purpose: Basic Science
Official Title: Glycemic Response of Bean-and-rice Meals in Persons With Type 2 Diabetes Mellitus

Resource links provided by NLM:

Further study details as provided by Arizona State University:

Primary Outcome Measures:
  • Net blood glucose changes over time [ Time Frame: fasting baseline glucose at time 0, then 30, 60, 90, 120, 150, and 180 minutes postprandial ]
    Capillary blood samples were collected via fingerstick using Safe-T-Fill® Lithium Heparin Mini Capillary Collection 125µl tubes (RAM Scientific, Yonkers, NY). Whole blood samples were analyzed for glucose content using the Yellow Springs Instrument Stat Plus Analyzer (YSI Life Sciences, Yellow Springs, OH) immediately after blood collection.

Enrollment: 17
Study Start Date: November 2009
Study Completion Date: April 2010
Primary Completion Date: April 2010 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
No Intervention: Cross-over study
beans and rice in a 50 gram carbohydrate dose
Other: Whole cooked beans with rice meals
Three types of bean-and-rice meals all equal to 50 grams available CHO. Control treatment was 50 grams available CHO in the form of white rice alone.
Other Name: Bush Brothers & Company brand canned beans

Detailed Description:
The 4 test treatments will be administered randomly on a different morning, at least one week apart. Participants will be required to consume the entire test treatment meal in 7 minutes while being observed. All test foods will be purchased from local markets. Capillary blood samples will be collected (~50µl) at time 0 (fasting) and at 30, 60, 90, 120 and 180 minutes post-treatment (timing of the post-treatment blood draws started at time 0 [post-treatment], which is when the participant finishes consuming the treatment meal). Venous blood draws for insulin assessment will also be acquired at fasting and then every hour for the three hour study period. Anthropometric measures such as weight, height and waist circumference will be collected at screening and at the start of each test day. Thirteen hours before testing, participants will eat a control meal to reduce variation in glycemic responses on test days due to varying dietary intakes. This control meal will be selected by each participant before the start of the study. They will be provided a gift card to the chain restaurant to use to purchase their own meal. Since subjects serve as their own controls, the meals must be identical before each test draw. Participants will complete 24 hour recall food records the morning of each test day to provide information related to dietary protocol compliance.

Ages Eligible for Study:   35 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Eligible subjects will be between the ages of 35 and 75, have a body mass index value (BMI) between 22-40 kg/m2, be physician diagnosed with type 2 diabetes for at least six (6) months and currently controlling their blood glucose levels using dietary methods, exercise and/or through the use of oral hypoglycemic agents such as Metformin for at least three(3)months, and have an HbA1c <10%.

Exclusion Criteria:

  • Exclusion criteria included: the presence of unresolved health issues (e.g. hypertension not controlled by medication), evidence of condition(s) that would influence the participant's ability to complete the study such as gastrointestinal disease, weight changes of ≥10% of the participants body weight within a 6 month period, women who are either pregnant or breastfeeding, allergy to beans or latex, an HbA1c level >10% at screening, and the inability to follow study protocol.
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Please refer to this study by its identifier: NCT01241253

United States, Arizona
Arizona State University, Nutrition Program
Mesa, Arizona, United States, 85212
Sponsors and Collaborators
Arizona State University
United States Dry Bean Council
Principal Investigator: Donna M Winham, DrPH Arizona State University
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Donna M Winham, Arizona State University Identifier: NCT01241253     History of Changes
Other Study ID Numbers: NTS0020
Study First Received: October 27, 2010
Last Updated: November 12, 2010

Keywords provided by Arizona State University:
glycemic response
type 2 diabetes mellitus

Additional relevant MeSH terms:
Diabetes Mellitus
Diabetes Mellitus, Type 2
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases processed this record on April 24, 2017