AzTrials
AzTrials

Diet HabitNCT03783507

Foods Within a Meal and Food Liking Study

A study testing Order 1, Order 2 and Order 3 in people with Diet Habit and Obesity, run by The University of Tennessee, Knoxville at 1 site in United States.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
Search all trials

Trial summary

For weight loss to occur, energy intake needs to be reduced to incur an energy deficit. One dietary strategy that may facilitate weight loss is consuming a diet low in dietary energy density (ED). Read more about this study

Who is it for?
Ages 18 to 35 yearsHealthy volunteers can take part
Conditions the study is for
Diet Habit, Obesity
What is being tested?
Order 1, Order 2 and Order 3
Could I receive a placebo?
No, everyone receives an active treatment
How many people
62 participants
Where
1 siteUnited States
Study dates
13 Dec 2018to Dec 2026
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 35 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • age between 18 and 35 years;
  • body mass index (BMI) 18.5 to 24.9 kg/m2;
  • unrestrained eater (≤12 on Three Factor Eating Questionnaire (TFEQ);
  • chicken or tomato soup, chocolate sugar-free pudding, grapes, blueberry yogurt, macaroni and cheese, vanilla ice cream, pretzels, and honey graham snacks (rate all items ≥ 50mm on a visual analogue scale (VAS);
  • report regularly eating before 10 am; and
  • can complete all sessions within 8 weeks of the screening session, will be eligible for the study.

Who cannot join

  • report binge eating;
  • report a medical condition that influences eating;
  • report allergies to foods used in the investigation;
  • currently smoke;
  • report dietary restrictions;
  • report taking a medication that affects appetite;
  • report being pregnant or breast-feeding;
  • report being an athlete in training.

Trial locations and contacts

1 site in 1 country.

United States1 site
  • University of Tennessee, Knoxville

    Knoxville, Tennessee, 37996-1920

Other trials in United States

About this study

For weight loss to occur, energy intake needs to be reduced to incur an energy deficit. One dietary strategy that may facilitate weight loss is consuming a diet low in dietary energy density (ED). It is hypothesized that a diet low in ED, which can be achieved by a high intake of low-ED foods, low intake of high-ED foods, or a combination of the two, will allow a greater amount of volume of food to be consumed relative to energy consumed, which can assist with reducing energy intake.

To understand how best to lower the ED of the diet, it is important to understand the relationship between low-ED and high-ED foods. Behavioral economics is a framework that provides a foundation to understand that eating behaviors can be substitutes for each other. Substitute eating behaviors are two behaviors that change in the opposite direction of each other (i.e. one behavior increases as the other behavior decreases). If low-ED and high-ED foods are substitutes for each other, in situations in which low-ED food intake increases, high-ED food should automatically decrease, and vice versa. If they are not substitutes, when low-ED food intake increases, high-ED food intake should remain unchanged, and when high-ED food intake decreases, low-ED food intake should remain unchanged. When low-Ed and high-ED foods are not substitutes for each other, purposeful change in intake for both low- and high-ED foods need to occur to best lower dietary ED.

Thus, the purpose of this study is to investigate if low-ED foods and high-ED foods substitute for each other. Healthy weight adults will be served a meal over 4 sessions, with each meal containing 5 different food items. The foods in the meal will vary in ED: low-ED = 0 to 1.0 kcal/kg; medium-ED = 1.1 to 2.9 kcal/kg; high-ED = > 3.0 kcal/g. For the 4 sessions, the meals will include: 1) 3 low-ED foods, 0 medium-ED foods, 2 high-ED foods; 2) 3 low-ED foods, 1 medium-ED food, 1 high-ED food; 3) 1 low-ED food, 2-medium ED foods, 2 high-ED foods; and 4) 1 low-ED food, 3 medium-ED foods, and 1 high-ED food.

Read the detailed description

All participants will be asked to come to HEAL for 1, 60-minute screening session and 4, 30-minute meal sessions, with no more than two meal sessions occurring per week between the hours of 11:00am and 7:00pm. For each participant, each meal session will need to occur within the same two-hr time frame (i.e., all meal sessions occurring between 11am and 1pm). During the first session interested participants will sign the consent form. After signing the consent form, eligibility will be confirmed by taking height and weight measures and confirming liking of foods, using a 100mm VAS. Participants will also be given questionnaires related to demographics. Prior to attending their meal session, participants will be asked to not change their typical eating pattern in the day prior to their session (including eating before 10 am), but to not eat within 3 hours of their session, and to not engage in physical activity for 24 hours prior to the session.

For the remaining four sessions, at the start of the session the participant will be asked to recall all foods and beverages consumed 24 hours prior to the scheduled appointment. During this recall if a participant reports consuming any foods or beverages besides water within 3 hours of the appointment, the appointment will be rescheduled. Participants will also be asked if they have participated in any physical activity 24 hours prior to their scheduled appointment. If the participant answers "yes," then the appointment will be rescheduled.

After completing hunger, fullness, and liking of foods questionnaires, participants will be presented with one of the four variations of meals. The exact brand and formulation of food products may change due to local availability. However, each participant will receive consistent products (and, thus, consistent weights of each food) across all of their meals. In other words, products may vary between participants but not within a single participant. Following the presentation of the meal, participants will be instructed to taste each food and that they will have 25 minutes to eat as much or as little as they would like of the meal provided. At the completion of 25 minutes, the lunch will be removed and the participant will be asked to complete a scale for evaluating levels of hunger, fullness, and liking of the foods. The participant will also be scheduled for a subsequent session the following week at a similar time. Upon completing all 5 sessions, participants will receive a $50 gift card.

Conditions
Diet Habit, Obesity
Being tested
Order 1, Order 2, Order 3, Order 4
Keywords
Energy Density
Medical subject headings
Feeding Behavior, Obesity

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Order 1Behavioural

    Meal Order 1:

    Meal Session 1 participant receives meal 1 (3 low-ED, 0 medium-ED, 2 high-ED) Meal Session 2 participant receives meal 2 (3 low-ED, 1 medium-ED,1 high-ED) Meal Session 3 participant receives meal 3 (1 low-ED, 2-medium ED, 2 high-ED) Meal Session 4 participant receives meal 4 (1 low-ED, 3 medium-ED, 1 high-ED)

  • Order 2Behavioural

    Meal Order 2:

    Meal Session 1 participant receives meal 2 (3 low-ED, 1 medium-ED,1 high-ED) Meal Session 2 participant receives meal 3 (1 low-ED, 2-medium ED, 2 high-ED) Meal Session 3 participant receives meal 4 (1 low-ED, 3 medium-ED, 1 high-ED) Meal Session 4 participant receives meal 1 (3 low-ED, 0 medium-ED, 2 high-ED)

  • Order 3Behavioural

    Meal Order 3:

    Meal Session 1 participant receives meal 3 (1 low-ED, 2-medium ED, 2 high-ED) Meal Session 2 participant receives meal 4 (1 low-ED, 3 medium-ED, 1 high-ED) Meal Session 3 participant receives meal 1 (3 low-ED, 0 medium-ED, 2 high-ED) Meal Session 4 participant receives meal 2 (3 low-ED, 1 medium-ED,1 high-ED)

  • Order 4Behavioural

    Meal Order 4:

    Meal Session 1 participant receives meal 4 (1 low-ED, 3 medium-ED, 1 high-ED) Meal Session 2 participant receives meal 1 (3 low-ED, 0 medium-ED, 2 high-ED) Meal Session 3 participant receives meal 2 (3 low-ED, 1 medium-ED,1 high-ED) Meal Session 4 participant receives meal 3 (1 low-ED, 2-medium ED, 2 high-ED)

Study groups in NCT03783507
Study groupRoleWhat they receive
Order 1ExperimentalMeal 1, Meal 2, Meal 3, Meal 4
Receives: Behavioral: Order 1
Order 2ExperimentalMeal 2, Meal 3, Meal 4, Meal 1
Receives: Behavioral: Order 2
Order 3ExperimentalMeal 3, Meal 4, Meal 1, Meal 2
Receives: Behavioral: Order 3
Order 4ExperimentalMeal 4, Meal 1, Meal 2, Meal 3
Receives: Behavioral: Order 4

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Meal Session 1 Consumption

    Energy intake will be calculated based upon grams consumed, manufacturer labels, and Nutrition Data System for Research (NDSR).

    Measured: After 30 minute meal

  2. Meal Session 2 Consumption

    Energy intake will be calculated based upon grams consumed, manufacturer labels, and Nutrition Data System for Research (NDSR).

    Measured: After 30 minute meal

  3. Meal Session 3 Consumption

    Energy intake will be calculated based upon grams consumed, manufacturer labels, and Nutrition Data System for Research (NDSR).

    Measured: After 30 minute meal

  4. Meal Session 4 Consumption

    Energy intake will be calculated based upon grams consumed, manufacturer labels, and Nutrition Data System for Research (NDSR).

    Measured: After 30 minute meal

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted21 Dec 2018
  2. Study start13 Dec 2018
  3. Primary completionDec 2026 (estimated)
  4. Study completionDec 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Screening
Allocation
Randomised
Intervention model
Factorial
Model description
In order to examine if low-ED foods and high-ED foods substitute for each other, a 4 X 4 mixed-factor design with a between-subjects factor of order and a within-subjects factor of meal will be used. For the within-subjects factor of meal, four meal conditions will be implemented. Participants will be randomized to one of 4 orders to reduce the possibility of an order effect. During all sessions, participants will be provided with 12 ounces of water.
Masking
Single blind
Who is masked
Participant
Enrolment
62 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03783507
Sponsor's protocol ID
UTK IRB-18-04832-XP
Status last verified
Jun 2026
First submitted
2 Dec 2018
Last updated
9 Jun 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Publications

  • Rolls BJ, Drewnowski A, Ledikwe JH. Changing the energy density of the diet as a strategy for weight management. J Am Diet Assoc. 2005 May;105(5 Suppl 1):S98-103. doi: 10.1016/j.jada.2005.02.033.

    PubMed 15867904
  • Rolls BJ. The relationship between dietary energy density and energy intake. Physiol Behav. 2009 Jul 14;97(5):609-15. doi: 10.1016/j.physbeh.2009.03.011. Epub 2009 Mar 20.

    PubMed 19303887
  • Epstein, L.H.; Saelens, B.E. Behavioral Economics of Obesity: Food Intake and Energy Expenditure. In Reframing Health Behavior Change with Behavioral Economics; Bickel, W.K., Vuchinich, R.E., Eds.; Lawrence Associate, Inc.: Mahwah, NJ, USA, 2000; pp. 293-311.

  • Just, D.R.; Mancino, L.; Wansink, B. Could Behavioral Economics Help Improve Diet Quality for Nutrition Assistance Program Participants? Economic Research Report No. ERR-43; U.S. Department of Agriculture: Washington, DC, USA, 2007.

  • Madden, G.J. A Behavioral Economics Primer. In Reframing Health Behavior Change with Behavioral Economics; Bickel, W.K., Vuchinich, R.E., Eds.; Lawrence Associate, Inc.: Mahwah, NJ, USA, 2000; pp. 3-26.

Questions about this trial

What is this clinical trial studying?

A study testing Order 1, Order 2 and Order 3 in people with Diet Habit and Obesity, run by The University of Tennessee, Knoxville at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 9 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Meal Session 1 Consumption (time frame: After 30 minute meal). The study lists 4 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT03783507, which also lists 5 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 9 Jun 2026.

Free account

Log in to keep searching

You’ve used your 3 free searches. AzTrials is free: log in or create a free account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in