I learned as an adult that the phrase, "breakfast is the most important meal of the day" was an advertisement tagline for breakfast cerals in the 1920's; and then quickly learned that prior to that, it was really rare for humans to eat anything before about 11am. I also learned that the mid-day meal (lunch) was usually the big meal of the day, and those social dinners that the elites would put on in the evenings were *supposed* to be a ridiculous extravagance that rarely happens, as most of the time the late meal was just a snack before bed; and most people didn't get that. So for the majority of humanity prior to 1900, the massive noon meal was all they typically had.