The grain beetle can be found throughout the world, and it loves to attack many common types of food. Macaroni, sugar, biscuit mixes, rice and cereal frequently fall victim to the grain beetle. Homeowners commonly find grain beetles in locations where dry food is stored. Although diseases aren't associated with grain beetles, nobody wants to eat cereal that has had grain beetles swimming in it. A grain beetle cannot eat through a hard seed of corn, but it loves attacking processed cereal.