Well plant production for meat includes things like soybeans and corn. While they're non-perishable it's not what those in food-insecure places would want to eat. Grains yes, but I hazard malnutrition is owing to lack of other food sources.

On the local level I think companies lobby against redistributing excess foods for free to keep prices high. Something's got to give, either food waste is drastically diminished or we redistribute all of it.