PepsiCo's latest earnings numbers suggest that price cuts may be necessary to win back consumers.Coca-Cola (KO 1.46%) and other food companies have been able to do well over the past couple of years by passing along rising prices to consumers as a way of adapting to inflation. And through price increases, that has allowed them to generate revenue growth and improve upon their top and bottom lines. But as consumers have become more sensitive to rising prices, that strategy may simply not work anymore.Recentl ...