Shelves that held Chef Boyardee products are partially empty at a grocery in Pittsburgh, on Tuesday, Jan. 11, 2022. Shortages at U.S. grocery stores have grown in recent weeks as new problems — like the fast-spreading omicron variant and severe weather — have piled on to the supply chain struggles and labor shortages that have plagued retailers since the coronavirus pandemic began. (AP Photo/Gene J. Puskar)