Creative? Pull the other one. Name a few Spartan philosophers, sculptors or architects. I don't know enough about Samurai art but I've never heard of any. Not sure what you mean by Sadus, but if you're talking about Indian holy men, no, I don't think they're noted for theor strength, just for their stoicism. As for the Society of Jesus, damn' few of them starve.
In other words, if you're too stupid, or too obsessive, to eat well, but concentrate instead on killing people (Spartans and Samurai), or on peddling your particular variety of religion (saddhus and Jesuits) I don't really care what you eat.
As for starving artists, that's a romantic fantasy that I trace back to Goethe. Before that, it was a way of earning a living like any other. Since then, there've been plenty of rich, successful artists too: Alma-Tadema springs to mind. It's just that starving artists have a particular appeal for people who aren't very good. "Look at van Gogh," they say, "Never sold a painting in his life!" Logically, this the classic omitted middle. Sure, it's possible never to sell a painting because you're a misunderstood genius and way ahead of your time. It's also possible that you're just not very good; or lazy; or bad at marketing yourself; or....
Cheers,
R.