He said obesity was the biggest health challenge facing the country. In a speech to the Fabian Society, Johnson said: Just as the government has a moral duty to tackle poverty and exclusion, so it also has a duty to address obesity. But this is not a licence to hector and lecture people on how they should spend their lives – not least because this simply won’t work. Tackling obesity requires a much broader partnership, not only with families, but with employers, retailers, the leisure industry, the...