Table 1.

Example of an interaction in which a participant in the intervention arm submits SMS text messages to indicate the beginning and end of overnight fast and, in turn, is provided with automated, encouraging messages promoting cumulative adherence and achievement of the fasting goal.

Time stamp	Message status	Message content
February 17, 2013, 6:00 PM	Sent	Remember: Calories break a fast! Once you start, you need be calorie-free
February 17, 2013, 7:28 PM	Received	FAST
February 17, 2013, 7:29 PM	Response	Thanks! You are now running calorie free! Check back in the morning for your end time.
February 18, 2013, 7:00 AM	Sent	Your fast ends at 9.28 am. You can do it!
February 18, 2013, 9:55 AM	Received	EAT
February 17, 2013, 10:05 AM	Response	Congratulations! Your success rate is 100%. Nice work!