Individuals will receive special instructions on how to use the app and will self-monitor their weight, exercise and receive daily DPP core content through the app over 16 weeks plus guidance from a coach, and will thereafter receive post-core DPP content up to 52 weeks.

The control group will be a "usual care" condition in which participants are free to seek any assistance for their medical care during the study period plus a paper version of the DPP curriculum.

Subjects receiving the smartphone app will receive the DPP core curriculum for 16 weeks and then the post-core curriculum for 36 weeks through the app. The Noom mobile app allows secure patient monitoring through a participant dashboard that the coach can use to increase patient adherence and motivation to achieve DPP goals. The participant can log their food intake, weight, steps, exercise, in addition to participating in the DPP group interaction through the application.

Body weight recorded during follow-up appointments at the medical clinic.

Hemoglobin A1c measured during follow-up appointments at the medical clinic.

Work Productivity and Activity Impairment Questionnaire: General Health V2.0 (WPAI)

1. Are you currently employed (working for pay)?
2. During the past seven days, how many hours did you miss from work because of your health problems?
3. During the past seven days, how many hours did you miss from work because of any other reason, such as vacation, holidays, time off to participate in this study?
4. During the past seven days, how many hours did you actually work?
5. During the past seven days, how much did your health problems affect your productivity while you were working? (0-10, higher is more impact)
6. During the past seven days, how much did your health problems affect your ability to do your regular daily activities, other than work at a job? By regular activities, we mean the usual activities you do, such as work around the house, shopping, childcare, exercising, studying, etc.(0-10, higher is more impact)