Food safe ways to discourage insects to go in the cupboards?

Besides putting the food into containers and stuff. Are there any sorts of herbs or something? Or a repellent that won't contaminate the food? Thanks.

Believe it or not ordinary table salt and pepper work great, salt tends to dry the insects body quickly which they don't like and the pepper has a burn when they clean their legs again they don't like the spice, just shake on shelves in drawers and under cabinets...hope this helps good luck

cedar may help but it wont entirely deter them if they are already bad.