While anyone who wants to stay fit knows to go easy on the booze and fries, it turns out keeping such temptations at a literal distance is key to a healthy heart. Living within a 15 minute walk of pubs and fast food outlets is associated with a greater risk of heart failure, going by health data covering half a million people in Britain. “Compared with those with no exposure to composite ready-to-eat food environments, participants in the highest density score category had a 16% higher risk of [heart failure],” the US-based researchers said, after assessing information from the UK Biobank, a d…