Meal portions (IMAGE) American Society for Nutrition Caption The researchers asked 44 men and women to each lunch in their laboratory once a week for 4 weeks. For each meal, the study participants received, in random order, a different portion of macaroni and cheese with water to drink. Credit Laboratory for the Study of Human Ingestive Behavior, The Pennsylvania State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.