LESSON 5 · Your Gut: The Hidden Brain
The Fermented Foods Lineup
Each fermented food brings something different to the table. Yogurt and kefir contain Lactobacillus and Bifidobacterium strains with some of the strongest evidence for gut health.

Not all fermented foods contain live cultures. Sourdough is baked, killing bacteria. Pasteurized sauerkraut is heated. For probiotic benefits, look for labels stating "contains live active cultures" and choose refrigerated products over shelf-stable ones.