The problem of this study was the ingestion of certain foods and their observed effects on behavior. The purpose of the study was to investigate the possible relationships between specific foods and (1) weight loss and gain; (2) hunger urges; (3) depression scores; (4) hand-eye coordination; (5) short-term auditory memory; and (6) heart rate. The subject in this study had previously been diagnosed as having sensitivities to certain foods. To determine the effects of certain foods on the subject a repeated measure design was employed. Specifically, an A-B-B-A-B-A design was used where A phases represented a 6-day period in which the subject ate foods to which she was sensitive. During earlier testing, the subject was found to be sensitive to corn, citrus fruit, pork, lamb, carrots, nuts, watermelon, and pineapple. These foods were found to induce irregular psycho-behavioral and physiological characteristics upon repeated and systematic testing procedures. Her nonreactive foods include fish, chicken, most green and yellow vegetables, bananas, cantaloupe, pears, apples, strawberries, and blueberries.