Yes, in fact the study that shows changes in the brain with functional MRI scans addressed food cravings, and was done with participants who were obese. The group that used tapping lost their cravings, and reached a healthy weight. This effect was long term because all participants experienced a change in their lifestyle patterns: they not only had the urge to eat healthy but also to exercise more. If you tap on the underlying issues of your eating habits, your relationship with food will change.