It obviously goes back to farms, but that answer isn't specific enough. Here's a couple of theories I have:
Eggs are easier to gather in the morning because the chickens have just woken up and they will be moving around away from the eggs. At night, you couldn't have eggs for dinner because the chickens would be sitting on them again.
Bacon can be brought out of a smokehouse so it's quicker than having a steak for dinner and when people get up they are groggy and they want something that doesn't take long to make.
A salad would make more sense for a lunch food because it would take longer to make on a farm since you would have to gather everything together from outside yourself. That still doesn't answer why it couldn't be for dinner, although some people say that people stereotypically want a light lunch to offset the breakfast.
What do you think?
Any theories of your own?
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