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10 fermented foods, and which are still alive

Fermented and alive are two different words, and almost every list online uses them as one. It comes down to heat. Live ferments have to stay cold, which is why they live in the chilled aisle. A jar of sauerkraut sitting on a warm shelf has been pasteurized so it can sit there, and pasteurizing kills the bacteria that the fermenting spent weeks building. Same cabbage, different food. Three on this list are fermented and not alive by the time they reach you. Tempeh gets fermented and then you cook it, which ends it. Sourdough ferments for hours and then goes in the oven, so the fermenting changed the bread rather than your gut. Vinegar pickles were never fermented at all; they are cucumbers sitting in acid doing an impression. What happened when people ate the live ones: a randomized trial put 36 adults on about six servings a day for ten weeks. Their gut microbes grew more diverse, and the more servings someone ate, the bigger the shift. Nineteen inflammatory proteins in their blood came down, interleukin-6 among them, and four types of immune cell showed less activation. Wastyk and colleagues, Cell, 2021. The honest size of it: one trial, 36 people. The markers moved. Nobody measured whether anybody felt better, so we will not tell you they did. The shopping rule fits on a sticky note. Chilled aisle. Read the label for live and active cultures, raw, unpasteurized, or naturally fermented. If vinegar sits high in the ingredients, put it back. You want salt and water. So which one did you think was alive? Kombucha, sourdough and pickles catch nearly everyone. Tell us in the comments.