A comment I got recently is one I know a lot of home bakers are quietly wondering about: if you dry your starter into a powder, does it still give you the same benefits as a fresh, actively fed sourdough culture? It's a fair thing to ask. So instead of just answering with "trust me," I went and pulled the actual research. Here's what it says. What Happens To Yeast And Bacteria When You Dry Them? Here's the part that surprises people: drying doesn't destroy the microorganisms in a natural starter. It removes their water, and without water, they can't stay metabolically active — so they shut down into a resting state instead. Dormant, not dead. This isn't a guess. A peer-reviewed food science study spray-dried a live sourdough culture into powder and directly measured how many organisms survived. The result: billions of living lactic acid bacteria and yeast cells per gram, still present immediately after drying. A separate scientific review foc...
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