Daniel and his friends are befriended by the master of the eunuchs in Nebuchadnezzar's court. But they refused to eat the meat and wine that the king provided.
Daniel proposed a test (the first and only experiment in the Bible) -- let them eat a non-alcoholic vegan diet for ten days and then compare them to the control group (who ate meat and wine) and then see who looks better.
So that's what they did, and the vegans looked better and were ten times smarter than all the king's magicians and astrologers.
The text and notes for this episode can be found here: https://skepticsannotatedbible.com/fewer-words/209.html
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