There are four principles of behavior change called the 4 S’s. They have been extensively studied in the behavior science literature. They are 1) Self-monitoring which is writing down what you eat and the exercises you do or having this done passively. In some cases behavioral variables are also recorded; 2) Stimulus Control is planning ahead for future events related to the behavior. For example, in a scenario not related to diet if you know the floor will be cold below your bed, you could put slippers on the floor before going to sleep; 3) Stress reduction techniques such as meditation and music; and 4) Social support from family and friends or a support group. These 4 S’s are central behavior principles that also provide useful practical guidelines.