The Microbiome: Your Second Brain
100 trillion bacteria across 1,000+ species live in your gut. They influence digestion, immunity, mood (90% of serotonin is gut-produced), metabolism, and even food cravings. Diversity is the goal — more species = more resilient gut.
Prebiotics: Feed Your Bacteria
Soluble fiber (oats, legumes, apples) ferments into short-chain fatty acids (butyrate, acetate). Resistant starch (cooled potatoes, green bananas, cooked-and-cooled rice) feeds beneficial species. Aim for 30+ different plant foods per week for microbial diversity.
Polyphenols: The Forgotten Prebiotic
Dark chocolate, berries, green tea, coffee, and olive oil contain polyphenols that gut bacteria convert into bioactive compounds. These metabolites have anti-inflammatory, neuroprotective, and cardiovascular benefits.
Fermented Foods
Yogurt, kefir, sauerkraut, kimchi, and kombucha contain live bacteria. While they don't permanently colonize, they improve gut barrier function and reduce inflammation. Aim for 1-2 servings daily.
What Damages the Gut
Artificial sweeteners (some alter microbiome composition), chronic stress (reduces microbial diversity), antibiotics (collateral damage — always follow with probiotic + prebiotic recovery), ultra-processed foods (emulsifiers may disrupt gut barrier).