Health and wellness are set to become even bigger priorities for tomorrow's shoppers, retailers attending the ACS summit were told.

With more than 10% of the world's population officially classed as obese, helping people to be more healthy would become a big issue, said David Smith, chief executive of strategic think tank Global Futures.

Products and services which allowed people to test their health in-store would become increasingly popular, and the demand for healthier food-to-go products would also grow. "Convenience stores are best placed to offer fast food which won't turn us all into Tellytubbies," Smith said.

The steady rise in popularity of local foods was likely to continue well into the next decade, he added.

Retailers of the future would also need to be much quicker to adapt to changing consumer trends, he warned. "Staying normal will not be the answer to surviving in the future. Retailers will have to evolve. If things feel under control, then you are not going fast enough," he said.