"Breakfast is the most important meal of the day" was created by a marketing campaign for Grape Nuts. Doing research into it seems like a very good idea, rather than just trusting "intuition", especially if it may just be an echo of that marketing message and not biological evidence.

https://bettermarketing.pub/how-marketing-created-the-most-i...

Nutrition research is hard, mostly reliant on self-reported or animal studies, and the quality has been low. I am happy to have more repeatable and ethical research done to help better understand what really drives our biological systems.