Metabolic Effects of Pulse Consumption on Biomarkers in Adults With Type 2 Diabetes or Met Syn (PGRIV)

Metabolic Effects of Pulse Consumption on Biomarkers in Adults With Type 2 Diabetes Mellitus or Metabolic Syndrome

The purpose of this study is to determine glycemic response of four different meals containing either whole green peas, whole lentils, powdered green peas, or powdered lentils in comparison to Glucola. Participants are adults with type 2 diabetes mellitus or metabolic syndrome.

Study Overview

• Status: Completed
• Conditions: Metabolic Syndrome; Type2 Diabetes Mellitus
• Intervention / Treatment: Dietary supplement: Glucola; Dietary supplement: Whole pea meal; Dietary supplement: Pea flour meal; Dietary supplement: Whole lentils; Dietary supplement: Lentil flour

Detailed Description

The 5 test treatments (Glucola, whole green peas, green pea flour, whole lentils, and lentil flour) will be administered randomly over five weeks. The test Participants will be required to consume the entire test treatment meal in 12 minutes while being observed. Venous blood samples will be collected for blood glucose and insulin levels 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). During the first visit blood was drawn for a lipid panel and HbA1C values. Thyroid stimulating hormone (TSH) and complete blood count (CBC) values were analyzed during the second visit, and vitamin D levels analyzed during the final visit. Blood analysis was completed by a reputable biomarker diagnostics laboratory, Quest Diagnostics. Anthropometric measures such as weight, height, waist circumference, and blood pressure were collected at screening and at the start of each test day. Thirteen hours before testing, participants consumed a standardized frozen meal to reduce the potential variation in glycemic responses on test day due to varying pre-evening dietary intakes. This control meal was selected by each participant before the start of the study. Each participant was provided the same frozen meal every time, since the subjects serve as their own controls. The day before test day, participants completed a 24 hour food recall, satiety, and gastrointestinal questionnaires. The morning of each test day participants completed the International Physical Activity Questionnaire (IPAQ), satiety, and gastrointestinal questionnaires. Test meal and blood glucose results at the 5 test points were entered into SPSS statistical software (V. 25) for data cleaning and analysis. Physical activity and the 24 hour dietary recall data were used to classify individuals on activity and dietary quality. Satiety responses were compared against each of the 5 test meals for each participant as well as the gastrointestinal responses using SPSS.

• Study Type: Interventional
• Enrollment (Actual): 19
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Iowa
    • Ames, Iowa, United States, 50011
      • Iowa State University, Food Science and Human Nutrition Department

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 24 years to 70 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Age 24-70 years
• BMI between 22-40
• Medical diagnosis of type 2 diabetes
• HbA1C <10%)
• OR have 3+ indicators of metabolic syndrome (high triglycerides, low HDL-cholesterol, high blood pressure) plus prediabetes HbA1c.

Exclusion Criteria:

• Uncontrolled hypertension or other health issues, e.g., gastrointestinal disease
• Weight changes of >10% of participants body weight within a 6 month period
• Pregnant or breastfeeding
• Allergy to peas, lentils, tomatoes, gluten, or latex
• HgbA1c level of >10% at screening
• Unwillingness or inability to follow study protocol.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: None (Open Label)

Number of Arms

5

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Control - Glucola; Glucola control beverage	Dietary supplement: Glucola; 50 grams of Glucola sugar beverage
Experimental: Whole peas; Whole cooked peas in a 50 gram carbohydrate meal dose	Dietary supplement: Whole pea meal; Whole cooked peas with spaghetti sauce and a slice of bread.
Experimental: Pea Flour; Pea flour in a 50 gram carbohydrate meal dose	Dietary supplement: Pea flour meal; Pea flour with spaghetti sauce and a slice of bread.
Experimental: Whole lentils; Whole cooked lentils in a 50 gram carbohydrate meal dose	Dietary supplement: Whole lentils; Whole cooked lentils with spaghetti sauce and a slice of bread.
Experimental: Lentil flour; Lentil flour in a 50 gram carbohydrate meal dose	Dietary supplement: Lentil flour; Lentil flour with spaghetti sauce and a slice of bread.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in baseline blood glucose over 3 hours (glycemic response)	Venous blood samples were collected via venous catheter. Whole blood samples were analyzed for glucose content and insulin at Quest Diagnostics.	Time 0 (fasting) then every 30 minutes for 3 hours

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in satiety sensation	Satiety level measured using a visual analog scale (0-100) every 30 minutes postprandially. A higher score indicates greater satiety.	Time 0 (fasting) then every 30 minutes for 3 hours
Change in gastrointestinal symptoms	Gastrointestinal concerns and changes were noted on a descriptive questionnaire	3 hours postprandial, and 12 hours postprandial

Collaborators and Investigators

• Sponsor: Iowa State University
• Collaborators: USA Dry Pea & Lentil Council
• Investigators: Principal Investigator: Donna Winham, DrPH, Iowa State University

Study record dates

Study Major Dates

• Study Start (Actual): May 23, 2018
• Primary Completion (Actual): February 29, 2020
• Study Completion (Actual): February 29, 2020

Study Registration Dates

• First Submitted: January 16, 2020
• First Submitted That Met QC Criteria: November 23, 2021
• First Posted (Actual): December 6, 2021

Study Record Updates

• Last Update Posted (Actual): December 6, 2021
• Last Update Submitted That Met QC Criteria: November 23, 2021
• Last Verified: November 1, 2021

More Information

Terms related to this study

• Keywords: Type 2 diabetes; Metabolic Syndrome; Glucose; Glycemic response; Legumes
• Additional Relevant MeSH Terms: Pathologic Processes; Glucose Metabolism Disorders; Metabolic Diseases; Endocrine System Diseases; Disease; Insulin Resistance; Hyperinsulinism; Diabetes Mellitus; Diabetes Mellitus, Type 2; Syndrome; Metabolic Syndrome
• Other Study ID Numbers: 17-191

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No