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More than one in four adults in the UK are obese. To tackle the issue of obesity, the government have banned junk food advertising on television before 9pm and completely for online promotions. But some researchers argue that other factors such as genes and hormones are at play. 91������ InDepth is the home of the best news analysis, with fresh perspectives that challenge assumptions and deep reporting on the biggest issues of the day. You can find more articles from InDepth - like this one - on the 91������ News website and app.