Researchers are testing how interventions at supermarkets - like putting mirrors in trolleys, introducing a 'fresh' section in shopper's baskets and using clearer signage - might change eating (and spending) habits.

It's sustainable. Many grocers have tried to solve the packaging waste problem, but Berlin-based supermarket Original Unverpackt thinks it has the answer. Replacing boxed or encased grocery items with bulk-bin style shopping, the supermarket is entirely packaging-free.

As shoppers move online, real-world stores are finding themselves with floor space to fill. Following the example of major players like Tesco, retailers are providing services to complement their existing offerings and enhance their core business.

According to the Food Marketing Institute (FMI) 2009 US Grocery Shopper Trends Report, American consumers are changing their food shopping behaviour and focusing on price and value during the recession.