ELI5 Breakfast - Is it the most important meal of the day?

Why is breakfast "the most important meal of the day"? Where did the phrase even come from?

... We explain like i'm five!

 

Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: bca1849, mredding, shleppenwolf & lyrical_myrical

 

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