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Glycemic Response to High Amylose Rice

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01685879
Recruitment Status : Completed
First Posted : September 14, 2012
Last Update Posted : September 1, 2014
Information provided by (Responsible Party):
Maria Stewart, University of Hawaii

Brief Summary:
Certain types of rice have more dietary fiber than others. This type of rice is known a "high amylose rice." This study hypothesizes that high-amylose rice, will decrease blood glucose and insulin responses after consumption compared to conventional rice in healthy adults, ages 18-40. Eighteen healthy men and women will participate in this study. This study will determine how high blood glucose and insulin values rise after eating a portion of rice. This study will also evaluate hunger ratings after consuming rice. The results of this study will help researchers better understand how diet can influence diabetes management.

Condition or disease Intervention/treatment Phase
Diabetes Treatment (Pilot Study) Other: Rice Other: Glucose Beverage Not Applicable

Detailed Description:

This is a pilot study to assess glucose response in humans to a rice sample prepared with high amylose rice (high amylose rice 1 and high amylose rice 2), compared to conventional rice and a glucose test beverage.

Study Design: The proposed study is a randomized single-blind crossover design with repeated measures using human subjects (clinical study).

Treatment: The amount of resistant starch, a type of dietary fiber, is greater for high amylose varieties of rice than conventional varieties of rice. High amylose rice is commercially produced in Louisiana and Arkansas, USA. This specific rice has been bred to contain more amylose than ordinary (conventional) rice. This food is not genetically modified.

Brief Methods: Study subjects (men and women) aged 18-40 years old will be recruited from the UH-Manoa campus and Honolulu area via flyers. Interested individuals will be screened by telephone for initial eligibility (nonsmoker, non-vegetarian, habitual breakfast eater, able to fast for 12 hours, available 7:00am-10:00 am on weekdays, willing to participate in study). Based on the initial phone screening, eligible study subjects will attend an enrollment visit to complete the consent form, obtain study materials, and confirm health status and eligibility based on subject inclusion and exclusion criteria. Individuals who do not meet study eligibility will have all records destroyed. 18 healthy subjects (9 men and 9 women) will attend 4 morning study visits at the RMATRIX CRC at The Queens Medical Center. Subjects will complete a 24-hour food record for the 24 hours prior to the study visit. Subjects will be fasted for 12 hours at the time of the study visit. Upon arrival, subjects will have an IV inserted for serial blood draws, fasting blood samples will be obtained (time = 0). Subjects will then be presented one of four treatments in random order: high amylose rice-1, high amylose rice-2, conventional rice or glucose beverage. Subjects will be instructed to consume the sample or beverage within 15 minutes. Blood samples will be taken at 15, 30, 45, 60, 90, and 120 minutes. Subjects will complete an appetite survey after each blood draw. Upon completion of the study visit, subjects will be offered a snack and juice and monitored for safety.

Study staff: A graduate research assistant in the Nutrition graduate program will coordinate the clinical study. Undergraduate research assistants will assist with study visits. All students will be working under Dr. Stewart's supervision. All study staff will complete UHM biosafety training, UMH blood borne pathogens training, and UMH or NIH human subjects training.

Clinical Support: The study will be supported by nursing staff from the RMATRIX PCR to perform IV catheter insertion, collect serial blood samples and monitor for adverse events.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 18 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single (Participant)
Primary Purpose: Basic Science
Official Title: Glycemic Response to High Amylose Rice
Study Start Date : October 2012
Actual Primary Completion Date : October 2013
Actual Study Completion Date : January 2014

Arm Intervention/treatment
Experimental: High Amylose Rice 1
Test rice with high dietary fiber content
Other: Rice
Rice portion containing 50 g total carbohydrate

Experimental: High Amylose Rice 2
Test rice with high dietary fiber content
Other: Rice
Rice portion that provides 50 g total carbohydrate.

Placebo Comparator: Control Rice
Rice portion that contains 50 g carbohydrate.
Other: Rice
Rice portion that provides 50 g total carbohydrate.

Placebo Comparator: Glucose beverage
Glucose beverage with 50 g carbohydrate
Other: Glucose Beverage
Glucose beverage that provides 50 g total carbohydrate.

Primary Outcome Measures :
  1. Blood Glucose response [ Time Frame: 120 minutes ]
    Evaluated changes in blood glucose after consuming a bolus of carbohydrate from rice or a standard glucose beverage.

Secondary Outcome Measures :
  1. Insulin Response [ Time Frame: 120 minutes ]
    Measure insulin concentrations after consuming a bolus of carbohydrate from rice or standard glucose beverage.

  2. Appetite Response [ Time Frame: 120 minutes ]
    Measure appetite after consuming a bolus of carbohydrate from rice or standard glucose beverage.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 40 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Gender: male or female

    • Age 18-40 years old
    • In good general health
    • Habitual breakfast eater
    • Able to fast for 12 hours
    • Available 7:00am-9:30am on weekdays
    • Willing to participate in study and complete 4 study visits within a 6-week period
    • Capable of giving informed consent

Exclusion Criteria:

  • Current smoker
  • BMI > 30 kg/m2
  • Current use of medications that alter appetite (antidepressants, antibiotics, weight loss medications, or appetite suppressants)
  • Current use of medications to control blood glucose, insulin or insulin receptors
  • History of pre-diabetes, diabetes, hyperglycemia, hyperinsulinemia, gastrointestinal disease or surgery, or eating disorders
  • Food allergy of any kind
  • Vegetarian
  • For females, pregnancy (current or within past 6 months) or lack of a regular menstrual cycle.
  • History of bleeding or clotting disorders (e.g. hemophilia, thrombocytopenia, Vitamin K deficiency, liver failure)
  • Current use of medications or supplements that may interfere with clotting and prolong bleeding time (e.g. aspirin, NSAIDS, coumadin, other anticoagulant therapy, herbal supplements including, but not limited to curcumin and flavonoids)
  • Problems with vascular access or difficulty tolerating blood draws

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 identifier (NCT number): NCT01685879

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United States, Hawaii
University of Hawaii at Manoa
Honolulu, Hawaii, United States, 96822
Sponsors and Collaborators
University of Hawaii
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Principal Investigator: Maria Stewart, PhD University of Hawaii at Manoa

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Responsible Party: Maria Stewart, Assistant Professor, University of Hawaii Identifier: NCT01685879    
Other Study ID Numbers: HARice
Project HAW00262H ( Other Grant/Funding Number: USDA )
First Posted: September 14, 2012    Key Record Dates
Last Update Posted: September 1, 2014
Last Verified: August 2014
Keywords provided by Maria Stewart, University of Hawaii:
postprandial glycemic response
postprandial insulin response