U.S. consumers’ loyalty to brand names at supermarkets is quickly evolving as they try new grocery products amid snarled supply chains and high inflation. Top food companies like Kraft Heinz Co. and Kellogg Co. are at dire risk of losing market share as supermarket operators grapple with shortages and fill empty store shelves with lower-cost brands, industry insiders told WSJ. American households are money-conscious more than ever as inflation hits four-decade highs and takes a bite out of their monthly spending budgets. Some consumers have broken ranks of years and years of brand loyalty only to buy whatever is on...