A new law in California aims to cut down on food waste and confusion among consumers. The state is banning the use of 'sell by' labels on food packaging, which are not an indicator of whether food is still safe to consume. Instead, manufacturers must use two standardized labels: a 'Best if Used By' label for peak quality and a 'Use By' label for product safety. This change is expected to simplify consumer decisions and reduce the estimated 20% of food waste in the US.