In this project, the investigators will assess eating patterns among teenagers and adults, and investigate whether a controlled TRF intervention leads to beneficial changes in MS. Study Part 1 uses an epidemiological approach to establish baseline daily eating behavior, physical activity patterns and sleeping habits of teenagers and adults over 4 weeks using the smartphone app. Those individuals meeting international criteria for MS and who have eaten for >14 hours per 24-hour cycle will be recruited for Study Part 2. In Part 2, participants will be assigned to TRF or active control groups, and followed in this pragmatic randomized controlled trial for 6 months to assess the change in their weight and MS components, as well as liver fat deposits. Study Part 3 will investigate the underlying mechanisms of improved metabolic profile with TRF.