The Influence of Satiation Measures on the Portion Size Effect

Lunch Feeding Study for Men and Women

The purpose of this study is to gain a better understanding of the satiation measures that influence human eating behavior in regard to intake of large portion sizes at a meal. The investigators hypothesize that satiation measures will influence the magnitude of the portion size effect at a meal. Additionally, other individual characteristics will be examined for their influence on the portion size effect. The portion size effect will be measured by serving a test meal once a week for four weeks in which the portion size of the entree will be varied.

Inclusion Criteria:

• Be willing and able to travel to Penn State University Park campus weekly for meals
• Be a man or woman 18 - 70 years old
• Regularly eat 3 meals/day
• Be willing to avoid alcohol the day before and during test days
• Have a body mass index between 18.0 and 35.0 kg/m*m
• Be willing to refrain from eating after 10 pm the evening before test sessions
• Be willing to participate in all study procedures

Exclusion Criteria:

• Must not be a smoker
• Must not be an athlete in training
• Must not be pregnant or breastfeeding at the time of screening
• Have taken prescription or non-prescription drugs that may affect appetite or food intake within the last 3 months
• Dislike or be unable to eat the test foods (because of allergies, intolerance, or dietary restrictions)
• Must not be currently dieting to gain or lose weight
• Have a health condition that affects appetite
• Have participated in a similar study in our lab in the past year
• Must not be a student, faculty, or staff member in nutritional sciences or psychology