IASO is an umbrella organisation for 52 national obesity associations across 56 countries. Its mission statement is to "improve global health by promoting the understanding of obesity and weight-related diseases through scientific research and dialogue, whilst encouraging the development of effective policies for their prevention and management."

The organisation is strongly advocacy-based and publishes frequent statements aimed at policymakers on how to tackle obesity. The website also contains detailed data on the global prevalence of obesity. Since obese people are often at high risk for other diseases such as diabetes or cardiovascular disease, the website also outlines these risks, offering links to other relevant associations.

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