预制菜、食品加工板块盘初走低，龙大美食、味知香跌超4%

Group 1 - The prepared food and food processing sectors experienced a decline at the beginning of trading on September 29, with companies like Longda Food and Weizhi Xiang dropping over 4% [1] - Other companies such as Anji Food, Huangshanghuang, and Ximai Food also saw significant declines [1]