Global Food Systems Driving Twin Crises of Obesity and Climate Change, Scientists Warn
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KUALA LUMPUR, Dec 22, 2025 — The way food is produced and consumed worldwide is fuelling two of the most urgent global challenges today: rising obesity rates and accelerating climate change, according to a major scientific review published by Frontiers in Science.
The research highlights that modern food systems, heavily reliant on ultra-processed foods and resource-intensive animal agriculture, are simultaneously harming human health and the planet. Diets dominated by energy-dense, nutrient-poor foods are driving obesity and non-communicable diseases, while the production of these foods contributes significantly to greenhouse gas emissions, deforestation, and environmental degradation.
Scientists warn that even if fossil fuel emissions were drastically reduced, current food production systems alone could push global temperatures beyond the 2°C limit set by the Paris Agreement. Livestock farming, particularly beef production, is identified as a major contributor due to its high land use, water consumption, and methane emissions.
The review emphasises that these crises are deeply interconnected. Foods that are most damaging to health often require the most environmentally harmful production methods. Conversely, shifting diets toward minimally processed, fibre-rich, plant-based foods could deliver dual benefits — reducing obesity while lowering environmental impact.
To address the problem, experts are calling for system-wide reforms, including taxes on unhealthy and ultra-processed foods, subsidies to make healthier foods more affordable, clearer food labelling, and restrictions on aggressive marketing to children. Policies that support healthy school meals and sustainable food sourcing are also highlighted as critical steps.
The findings underscore the need to move beyond individual responsibility and focus on transforming food environments. Researchers stress that tackling food systems holistically is essential to improving public health, protecting the environment, and ensuring long-term global food sustainability.
