Does this topic sound familiar? We've mentioned gut health in almost every newsletter this year (guilty as charged). But here’s the thing: we can’t talk about estrogen, fiber, skin, hydration, and PMOS without writing about the gut. It practically runs the show! It plays a part in your digestion (obviously), but also hormone metabolism, immune function, mood regulation, nutrient absorption, blood sugar balance, and even how your skin looks. It's not an exaggeration to say that a healthy gut is the foundation for a healthy everything else. So today, we're giving your gut the full spotlight. Scroll for the rundown on what it needs to thrive.
Prebiotics: feeding the good stuff
Prebiotics are types of fiber that your body can't digest, but the beneficial bacteria in your gut can. Think of them as fertilizer for your microbiome. When you eat prebiotic-rich foods, you're essentially feeding the bacteria that support digestion, immune function, and hormone metabolism.
Some of the best sources? Garlic, onions, leeks, asparagus, bananas (especially slightly green ones), artichokes, oats, and flaxseeds. If you're seed cycling with us, your daily flaxseeds during the follicular phase are pulling double duty—supporting estrogen metabolism through their lignans while also feeding your gut bacteria through their prebiotic fiber! The key with prebiotics is consistency. A single serving here and there won't move the needle. But building these foods into your meals regularly creates an environment where beneficial bacteria can flourish.
Probiotics: populating the good stuff
While prebiotics feed the bacteria you already have, probiotics introduce new beneficial strains. These are live microorganisms found in fermented foods (and supplements) that help maintain microbial diversity in your gut.
Some of the richest probiotic sources include: yogurt (look for "live and active cultures"), kefir, sauerkraut, kimchi, miso, tempeh, and kombucha. These foods have been part of traditional diets for centuries, and for good reason. They support digestion, reduce bloating, and contribute to a more resilient immune system.
A few things worth noting: not all fermented foods are created equal. Shelf-stable versions are often pasteurized, which kills the beneficial bacteria. Look for refrigerated options when possible! And if fermented foods are new to you, start small; a few tablespoons of sauerkraut added to your dinner and let your gut adjust.
Fiber: the unsung hero (again)
We dedicated an entire newsletter to fiber a few weeks ago, but it deserves another mention here because it's genuinely one of the most important things you can eat for your gut. And there are two types worth knowing about:
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Soluble fiber dissolves in water and forms a gel-like substance in your digestive tract. It slows digestion, helps stabilize blood sugar, and feeds your gut bacteria. You'll find it in oats, beans, lentils, apples, citrus, carrots, barley, and chia seeds.
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Insoluble fiber doesn't dissolve. It adds bulk to your stool and helps things move through your digestive tract more efficiently (aka the "keeps you regular" piece). Good sources include whole grains, nuts, seeds, the skins of fruits and veggies, broccoli, cauliflower, and leafy greens.
You need both. And most people aren't getting enough of either. Aiming for 25-35 grams of total fiber per day from a variety of sources is a great target. If you're currently on the lower end, increase gradually and drink plenty of water. Your gut will thank you for the slow ramp-up.
Why your hormones care about your gut
In our opinion, this is the connection that doesn't get enough attention. Your gut plays a direct role in hormone balance through something called the estrobolome—a collection of gut bacteria specifically responsible for metabolizing estrogen.
Here's how it works: after your liver processes estrogen, it sends the metabolized estrogen to your gut for elimination. When your gut microbiome is healthy and diverse, this process runs smoothly, and estrogen exits the body the way it should. When your gut is imbalanced (due to low fiber, poor microbial diversity, etc.), estrogen can get reactivated and sent back into circulation. This can contribute to estrogen dominance and all the symptoms that come with it. Think bloating, heavy periods, breast tenderness, mood swings, and hormonal breakouts.
Supporting the ripple effect
All to say, supporting your gut isn't just about digestion. It's about giving your body the ability to process and eliminate hormones efficiently. And that has a ripple effect on everything from your cycle to your skin to your luteal phase symptoms. Your gut also produces a significant amount of serotonin (some estimates suggest up to 90%). So when your microbiome is struggling, mood, anxiety, and sleep can all take a hit.
Simple ways to support your gut daily
You don't need a complicated protocol! Start with these:
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Include a source of prebiotic fiber at most meals (onions, garlic, oats, bananas, or flaxseeds).
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Add one fermented food to your daily routine; yes, even a few spoonfuls of sauerkraut with lunch or yogurt at breakfast counts.
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Build fiber in across the day rather than cramming it into one meal; aim for 2-3 colors per meal and you’ll nail this one!
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Stay hydrated (fiber needs water to do its job, as we covered this a few weeks ago) with electrolytes.
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Minimize ultra-processed foods and excess sugar, which can feed less beneficial bacteria and disrupt microbial balance.
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Manage stress where you can, because chronic stress directly impacts gut motility and microbiome composition.
Where seed cycling fits in
Seed cycling checks several gut-health boxes at once. Flaxseeds provide prebiotic fiber and lignans that support the estrobolome during the follicular phase. Pumpkin seeds add zinc, which supports gut lining integrity. During the luteal phase, sesame and sunflower seeds continue the fiber and mineral foundation with selenium and vitamin E. It's a small daily habit, but it does triple duty, supporting your gut, your hormones, and your mineral stores all at the same time.
Your gut is the foundation
Almost every topic we've covered this year, from PMS to PMOS—traces back to gut health in some way. It's not the most glamorous piece of the wellness puzzle, but it might be the most foundational. Feed it well, keep it diverse, and stay consistent. The downstream effects on everything else are worth it.