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Beyonce, Instagram

Instagram; Kevin Mazur/WireImage

It's very clear from Beyoncé's Grammy performance Sunday that Jay Z's wife takes very good care of her body.

And just how does Blue Ivy Carters mama pull off a fit while still curvy look like that? It might be thanks in part the 22-day vegan stint she did ahead of Hov's 44th birthday in December. And it certainly seems, from her latest Instagram post, that she's embarking on another 22-day challenge of eating no meat or animal products whatsoever!

On Jan. 29, the 32-year-old "Drunk in Love" singer shared a snap of her healthy snack—a peanut butter and chocolate chip flavored vegan protein bar bar cut up with sliced bananas on top. Bey captioned the shot of her no-gluten, no-soy, no-dairy snack simply, "#22daysvegan." (We're assuming this is vegan stint no. 2 and not a throwback to the first one—that'd be odd, even within the foodie culture of Instagram.)

So why is Beyoncé going vegan for 22 days, as opposed to 21 or 23? Hubby Jay Z explained on his  Life + Times blog before challenge no. 1 that "psychologists have said it takes 21 days to make or break a habit. On the 22nd day, you've found the way."

He said at the time switching to a "plant-based" lifestyle "just feels right," calling it "a spiritual and physical cleanse" of sorts.

No word yet on whether Hov is joining Queen Bey in challenge no. 2!