 Sample size, number of participants necessary to demonstrate an effect: The female BED-patients ate with a median speed of 44 quartile range: 35-53 gmin and the male patients ate with a median speed of 47 41-61 gmin during the week at home. Please not the large variation, making the slight sex difference statistically insignificant. Previous tests in the research laboratory have demonstrated that healthy, normal weight women and men eat with an average speed of approximately 30 gmin. Because the 25 pecentile speed of eating among female and male BED-patients is well above the mean speed of eating among the previouslty tested normal, healthy subject, it is necessary to recruite only 20 age-matched, healthy women and 10 men to demonstrate an effect. The effect will appear after one week of testing. The subjects will be recruited by advertisment at the local train station next to the campus of the Karolinska University Hospital, Huddinge. This manner of recruitment has been used in several experimental studies on eating behavior, using Mandometer, but normal weight, healthy subjects have never been tested at home. Also, previously tested subjects have been about 22 years old and the subjects to be recruited in the present trial should be matched for age with the BED-patients, i.e., they should be about 38 years old. A relatively extensive literature indicates, however, that eating behavior is similar among 20 and 40 year old humans. Even so, data from these control subjects are necessary for testing the hypotheses of the present trial. 