Keywords: Adolescents (13-19 years), Adults (20-59 years), Behaviour Modification (e.g., provision of item/tool, incentives, goal setting), Education / Awareness & Skill Development / Training, Family, Grade school aged (5-12 years), Home, Meta-analysis, Obesity, Primary health care provider office (e.g., Public health nurse, dietitian, social worker), Social Support (e.g., counseling, case management, outreach programs) , Youth Health