Many people who lose weight regain the weight after they finish their weight loss programme. Local authorities fund 12-week weight loss programmes free to people who are overweight, often from commercial providers. When one asks people who have successfully maintained their weight loss they frequently mention regular self-weighing, so that they can control their food intake and exercise levels if they start to gain a few pounds. In collaboration with Birmingham City Council, Birmingham Community Health Care NHS Trust and Flo Simple Telehealth, this programme was designed to help people maintain weight loss using text messages. After completing a 12-week weight loss programme 380 people were allocated by chance to ‘usual care’ which included a leaflet of hints and tips to keep weight off and a follow-up telephone call after 3 months; or the text programme. People allocated to the text programme received a weekly text asking them their weight and responding with simple supportive messages. People were asked to self-report their weight after 3 months and are being weighed after 9 months follow-up.