People who are obese run the risk of having cancer, diabetes, and cardiovascular disease. In the past, obesity was thought to be a personal illness that needed to be treated on an individual basis. The focus of obesity prevention strategies has switched to a social approach, which includes community-based initiatives. The purpose of this review is to describe community-based weight reduction programmes. Numerous community-based initiatives were covered, including the Diabetes Prevention Programme, the Intensive Lifestyle Intervention, Motivational Interviewing, and Prevent Obesity from Birth. Population-based community initiatives that foster connections between individuals, families, schools, and municipalities are recommended by organisations such as the World Health Organisation. Community-based weight-loss programmes are a useful tactic for reaching big numbers of people.