Thinking to premodern humans, do you think they would frequently have food waiting for them as soon as they awoke? Some days maybe, but then other days probably not.
Not surprisingly, I don't have proof of what I said, but I've read in articles and studies that breakfast (and meals in general) tend to anchor your circadian rhythms (Although, light is a stronger signal). I might have extrapolated from reading about fixing your rhythms after experiencing jet lag and also from my own experience.
Of course not. There's never been any significant evidence of health benefits from breakfast.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4078443/
http://yaledailynews.com/blog/2013/03/05/eating-times-affect...
Here's a HN discussion regarding a Harvard study on the subject, from 7 years ago: https://news.ycombinator.com/item?id=199394
Please provide some evidence that these studies are insignificant and incorrect.
I have no trouble believing that breakfast is relevant to circadian rhythms. This is far different from saying that skipping breakfast inevitably results in "sleeping later and waking up later as the rhythm shifts towards your first meal of the day." This is a very strong claim that demands strong evidence. Some studies linking circadian rhythm to meals is not sufficient.