Simply put, overweight results from having a positive energy balance — consuming more energy from food than the body expends. However, many variables can impact calorie intake and energy expenditure, including genetics, socioeconomic status, physical activity, and the gut microbiome.[1]
What causes overweight?
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•Last Updated: May 16, 2025
Overweight occurs when there is a positive energy balance, meaning that calorie intake from food exceeds the calories burned by the body. Various factors — such as genetics, socioeconomic status, physical activity, and the gut microbiome — can influence both calorie intake and energy expenditure.