The world's biggest ultra-processed food corporations are hindering global efforts to tackle the obesity crisis by suing governments that try to promote healthier diets, the head of the World Health Organization has said. Tedros Adhanom Ghebreyesus, the WHO director general, accused global food companies of obstructing the adoption of vital public health measures and costing countries billions of dollars in healthcare and legal costs in the process. Almost 1 billion people worldwide are living with obesity, and unhealthy diets are one of the main drivers of heart disease, type 2 diabetes and cancer. Ultra-processed food (UPF) consumption is soaring and now makes up half the average diet in many countries, including the UK, the US and Australia. Governments around the world, waking up to the health and economic impacts of the obesity crisis, have begun introducing measures designed to curb junk-food intake and promote healthier diets. These include front-of-pack warning labels, marketing and advertising restrictions on unhealthy products, and taxes on junk food. Publicly, the world's biggest UPF companies insist they back the policies. But an investigation ... found many of these same companies were taking governments to court to overturn, weaken or delay the policies. In total, 235 lawsuits were lodged over health policies targeting UPFs in Mexico, Colombia, Brazil, the US and the UK from 2010 to 2025, the investigation found.