Obesity is not just about food: Polluted air and chemicals disrupt metabolism

Sumit Jha

Feb 10, 2026

Health

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Picture this: a person is trying to lose weight and is eating less and healthier. Yet the scale keeps climbing despite their efforts.

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“We’ve created an obesogenic environment: ultra-processed food everywhere, pollution and pesticides quietly disrupt the body. In this environment, obesity rises and diabetes follows,” said Dr V Mohan.

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Air pollution and chemical exposures drive weight gain through biological pathways, regardless of how much a person eats or exercises.

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Evidence runs from laboratory models to population studies, showing how environmental factors reshape metabolism at the cellular level.

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Air pollution drives obesity through particulate matter (PM2.5, PM10) and gases such as nitrogen dioxide.