Table 1.

SNAP refresher campaign description

Refresher number	Time period	Format(s)	Message frequency (per week)	Topic and details
3	Fall 2012	Email	2	Topic: Weekly behavior change challenges Participants who decided to enrol in the refresher received weekly emails encouraging them to practice one intervention specific goal per week. Goals included daily self‐monitoring, choosing healthier (Small Changes) or lower calorie (Large Changes) snacks and food items and increasing daily steps (Small Changes) or exercise intensity (Large Changes). Participants in the Yellow or Red Zones were encouraged to complete goals on a daily basis, whereas participants in the Green Zone were encouraged to meet goals 3–4 d per week. At the end of each week, participants were sent an email request for reporting weight and compliance with weekly goals. Participants could earn $5 each week for submitting a challenge report.
4	Spring 2013	Email	2	Topic: Spring transformation Participants who enrolled in Small Changes were encouraged to make one healthy habit and break one healthy habit for the refresher series. Participants were given a list of habits from which they selected the most applicable habit change. Examples of healthy habits to make included drinking a glass of water before each meal, practicing portion control at lunch or dinner and eating slower. Examples of unhealthy habits to break included sitting for prolonged periods of time, eating dessert every night and unplanned snacking. Participants were provided tangible cues (e.g. re‐usable tumbler for increasing drinking water; standing balance disk for reducing sitting time), valued at $10–15 each, to support habit changes. Participants who enrolled in the Large Changes group were given a choice of three exercise DVD's (light, moderate and intense valued at $10). Participants were encouraged to use this DVD to add to their current exercise routine and to meet their exercise goal (250 min per week). Participants were also encouraged to self‐monitor their daily calorie intake. At the end of each week, participants were sent an email request for reporting weight and compliance with weekly goals.
5	Fall 2013	Email	2	Topic: Diet change challenges Participants who enrolled were given four different diet changes to try each week. The weekly email also included research on the topic. The weekly challenges included: changes to breakfast, hunger and appetite awareness (hunger scale), Mediterranean diet and weekend versus weekday eating. The challenges were set to be appropriate for Small versus Large behavior changes using the same challenge theme each week. Participants were informed that submitting a report on the challenge each week could earn anywhere from $1 to $15, and the amount would be randomly selected each week.