Research firm Bernstein has lowered its rating on five top food brand names as it sees weaker industry trends.

Conagra(CAG) - Get Report  , General Mills(GIS) - Get Report  , Campbell(CPB) - Get Report  , Kellogg(K) - Get Report and J.M. Smucker (SJM) - Get Report have all been downgraded to "underperform" from "market perform."

The firm believes that a recent downturn in sales is reflective of ongoing consumer behavior, which is turning toward fresher and more health conscience food choices.