The consequences of a poor diet could scarcely have been spelt out more starkly last week, when a British Medical Journal study linked eating an abundance of ultra-processed food with 32 damaging health outcomes, from weight gain and cancer to depression and anxiety. Examining data from different studies of nearly ten million people worldwide, academics found that those who ate the most UPF were at a 21 per cent greater risk of dying young.

Meanwhile, the pressure for retailers to accept more responsibility for our health has never been greater. Another report last week, by the charity Nesta, found that if Britain’s 11 biggest supermarket chains prioritised healthy food, with supportive “nudges” such as offering bogof deals on vegetables, obesity rates could be slashed by