What is the origin of the idiom "eat someone or something for breakfast" and when to use it?

The idiom "eat someone or something for breakfast" implies that the person or thing being defeated is weak or insignificant, and can be easily consumed or handled. The origin of this phrase is uncertain, but it is believed to have originated in the United States in the early 1900s. It may have been influenced by the idea of a predator eating its prey, or by the idea of a person consuming a meal with ease. In modern usage, this idiom is often used in sports, politics, or business to describe a situation where one person or team dominates another with ease.