 The investigators aim to address the key problem of how to implement U.S.Preventive Services Task Force obesity treatment recommendations in a cost-effective manner. The investigators propose a Randomized Clinical Trial - Maintaining Activity and Nutrition through Technology-Assisted Innovation in Primary Care MAINTAIN-PC - to test whether a group of primary care patients who have lost at least 5 of their body weight in the past year will be more likely to maintain their weight loss with a multifaceted intervention that includes online tracking tools, web-based coaching visits, and PCP engagement through real time electronic progress reports with counseling tips than when using online tracking tools alone. By integrating this intervention within an existing electronic health record and clinical flow, the investigators maximize potential for future dissemination. 