You are correct in that the American breakfast as we know it is one largely (in many senses of the word) invented to make us consume more. Italian breakfast is

You are correct in that the American breakfast as we know it is one largely (in many senses of the word) invented to make us consume more. Italian breakfast is a shot of espresso. Maybe a croissant if you're really that hungry. Then you get a monster lunch at noon. Neither system is superior, it's just what works in either culture. Which is to say, there is no universal nutrition advice since everyone's body and microbiome and working culture is different. Pick and choose what works for you because only you process the food you eat.