Governments could slow or even reverse the growing obesity epidemic if they introduced more regulation into the global market for fast foods such as burgers, chips and fizzy drinks, researchers said on Monday. A study published in the Bulletin of the World Health Organisation (WHO) suggested that if governments took firmer action, they could start to prevent people becoming overweight and obese – conditions with serious long-term consequences such as diabetes, heart diseases and cancer. “Unless governments take steps to regulate their economies, the invisible hand of the market will continue to promote obesity worldwide with disastrous consequences for future public health and economic productivity,” said Roberto De Vogli of the University of California, Davis, in the United States, who led the study. The WHO is urging governments to do more to try to prevent obesity happening in the first place, rather than risking the high human and economic costs when it does.