They may have a point in the US which consumes a significant amount of processed food where the input of energy, marketing and transportation are big factors in the overall cost. They are also organisations who's members live and die by biofuels.
Here's what Scott Faber Vice President for Federal Affairs at the The Grocery Manufacturers Association said before the Energy and Air Quality Subcommittee
Of the House Committee on Energy and Commerce on May 6, 2008. He takes a different view, but then his members live or die by the margin they get for the things on their shelves.
Hattip to Domestic fuel.