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Variability In Mixed Meal Tests: Fixed Versus Adjusted to Energy Needs Caloric Dose

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) · NCT06223555

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Opens the official ClinicalTrials.gov record, with the study team’s contacts. Bored Studies doesn’t enroll anyone.

Key facts

Compensation
Not posted. Ask the study team before screening.
Who can join
Ages 18–99 · All sexes
Healthy volunteers
Accepted
Study type
Interventional · Not applicable
Target enrollment
79
US sites recruiting
1
Study start
August 23, 2024
Record last updated
September 21, 2026

Status re-checked against ClinicalTrials.gov within the last 12 hours.

What the study is about

Background

Researchers use mixed meal tolerance tests (MMTTs) to look at how people s bodies respond to eating a meal. However, researchers do not agree on how to decide the number of calories to give in each meal. Some use fixed meals, which are the same size for everyone, and some use adjusted meals, based on the size of the person s body. Researchers want to know which MMTT is best to use for future research.

Objective

To learn how fixed vs adjusted meals affect blood glucose levels in healthy people.

Eligibility

Healthy people aged 18 years or older.

Design

Participants will have 3 or 4 clinic visits of up to 8 hours in 8 weeks.

Participants will have baseline tests

Their height, weight, and waist size will be measured.

They will have an oral glucose tolerance test: A needle attached to a tube (IV) will be inserted into a vein in the arm. They will have a sugary drink. Blood samples will be taken from the tube at intervals up to 3 hours after the drink.

They will have a body scan.

Participants will have 2 MMTT visits. One will include a fixed meal and one will include an adjusted meal. They will have tests at both visits:

Resting metabolic rate: A clear hood will be placed over the participant s head while they rest for 20 minutes. This will measure the oxygen they breathe in and out.

MMTT. Participants will have 5 minutes to drink a liquid meal. Blood samples will be taken at intervals for the next 4 hours....

Being studied: Fixed Mixed Meal Test; Adjusted Mixed Meal Test

Conditions: Obesity; Healthy Volunteer

Eligibility criteria

Copied from the official record. The study team makes the final decision at screening.

Show full criteria
  • INCLUSION CRITERIA:

In order to be eligible to participate in this study, an individual must meet all of the following criteria:

  • Provision of signed and dated informed consent form.
  • Agreement to adhere to Lifestyle Considerations throughout study duration.
  • Males and females; Age >= 18years
  • Healthy, as determined by medical history, physical examination, and laboratory tests.

EXCLUSION CRITERIA

An individual who meets any of the following criteria will be excluded from participation in this

study:

  • Current use of medications, dietary supplements, or alternative therapies known to alter energy metabolism.
  • Fasting plasma glucose >= 126 mg/dL
  • Type I or Type II Diabetes Mellitus by self-report.
  • Hematologic disorders including significant anemia (male hemoglobin \< 13.0 g/dL or female hemoglobin \< 11.0 g/dL)
  • Current pregnancy, pregnancy within the past 6 months or currently lactating
  • History or self-report of gastrointestinal disease, including inflammatory bowel diseases (e.g. Chron s disease and ulcerative colitis), malabsorption syndromes (e.g. celiac disease), gastric ulcer (active) which may alter metabolism or absorption of study food by self-report
  • Evidence of alcohol abuse as defined by an 8-point score on the Alcohol consumption screening AUDIT questionnaire in adults.
  • Participants who report taking large doses of acetaminophen (> 3 grams daily) who cannot stop acetaminophen 24 hours prior to and following the meal tests will be excluded from the study.
  • Inability to consume provided food based on a food allergy or intolerance.
  • Conditions not specifically mentioned above may serve as criteria for exclusion at the discretion of the investigators.
  • Any disorder, unwillingness, or inability not covered by any other exclusion criteria which, in the investigator s and/or team s opinion, jeopardizes the safety of the participant or others or would interfere with adherence to the protocol (such as claustrophobia).

Conditions not specifically mentioned above may serve as criteria for exclusion at the discretion of the investigators.

Recruiting US locations

  • NIDDK, Phoenix

    Phoenix, AZ 85014

    Site contact: Susi Votruba, Ph.D. · 602-200-5336 · votrubas@niddk.nih.gov

Study contacts (from the official record)

  • Susanne M Votruba, Ph.D. · (602) 200-5336 · votrubas@mail.nih.gov
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Variability In Mixed Meal Tests: Fixed Versus Adjusted to Energy… (NCT06223555) | Bored Studies