This question is not about nutrition. I am not asking whether the kinds of foods that people typically have during breakfast (esp. cereals) are healthier than other foods.
The claim is often made that the food is somehow digested “better” (more efficiently?) when consumed early in the day (shortly after waking up). It is claimed furthermore that extreme deviation from a traditional three-meal rhythm (esp. eating stuff in the middle of the night) is unhealthy. How much is there to it?
I am skeptical about these claims because I have seen no reason to believe that the digestive system is any less capable of digesting food at any time during the day. Although it may well be slower in digesting food at some times than others, I don’t see how that makes any difference to energy content and health consequences.