Apr 21 • 🥑 Nutrition
Before you buy another probiotic, are you feeding the bacteria you already have?
Most probiotic shopping starts with the biggest CFU number on the label. That usually misses the point.
What matters first is whether your gut bacteria have anything to eat. Prebiotic foods like oats, onions, garlic, slightly green bananas, and cooked-then-cooled potatoes give microbes the fiber they turn into short-chain fatty acids that help support the gut lining.
Then there’s strain specificity. A probiotic is not just a probiotic. Lactobacillus rhamnosus GG has good evidence for reducing antibiotic-associated diarrhea. Bifidobacterium infantis 35624 has human data for IBS symptoms like bloating and abdominal pain. If the label only says “contains probiotics” without the actual strain, it’s mostly marketing.
One of the more interesting studies here came from Stanford in 2021. People eating more fermented foods over 10 weeks increased microbiome diversity and lowered 19 inflammatory proteins. The high-fiber group improved microbial activity, but diversity did not move the same way during that short window.
My practical order of operations is simple: feed the microbiome first, add fermented foods a few times per week, then use a targeted probiotic if there’s a clear reason. Not medical advice, just a much better starting point than guessing from the supplement aisle.
What’s been more useful for you personally: fermented foods, extra fiber, or a probiotic that actually matched a specific goal?
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Before you buy another probiotic, are you feeding the bacteria you already have?
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