Sainsbury's chief executive Justin King this week called for a consistent approach to front-of pack labelling as he revealed that he had been sharing his traffic-light data with rivals.

He said he was happy to show results from its Wheel of Health to anyone interested in adopting traffic lights. "We have already shared it with Asda and we will share it with Waitrose to facilitate the consistency that is so clearly called for by parents and other consumers." The comments were made during a meeting organised by Sainsbury's and attended by Caroline Flint. The New Ideas for Health seminar brought together 100 experts and parents to discuss barriers to healthy eating.

Issues raised by parents during the event included lack of time, being stuck in a rut and outside influences. But they acknowledged that small changes, like sitting down for family meals and smaller portion sizes, could make a difference.