Foods Within a Meal and Food Liking Study

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.

Inclusion criteria

• 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.

Exclusion criteria

• 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.