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.