Hormel Foods Corp. agreed to buy Applegate Farms LLC for about $775 million, a move that would give the maker of Spam a foothold in the organic-meats category. paid $7.7 billion for Hillshire Brands Co., which makes Jimmy Dean sausages, and Post Holdings Inc. bought egg and dairy-goods company Michael Foods Group Inc. A change in consumer eating habits is underpinning consolidation in the sector.