There are any number of books written before the 19th century that mention having something to eat to start the day.
If you are talking about eating only certain foods then that is correct but eating something in the morning, if you have it, have been a thing since we started cooking.
And that was a very long time ago.
Quite frankly nonsense.
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No argument from me, I was simply commenting on an article I recently read that included that contention.