Regarding to the diamond ring thing: Most "old traditions" or "old traditional things" aren't actually old at all. In most cases, something that has been done for longer than you are alive counts as "old tradition", because we don't experience the past through history books and facts, but through our experience and through what adults told us when we grew up.

There have definitely been studies linking breakfast to various positive lifestyle outcomes, but that doesn't mean you need 9 grapefruits and 4 bowls of kelloggs flakes. I don't eat breakfast much myself but most of what I've run across has shown that it's beneficial.

https://pmc.ncbi.nlm.nih.gov/articles/PMC3737458/