The short answer
Five gut habits do most of the heavy lifting for skin: chew your food properly, balance blood sugar at every meal, eat 30g of fibre a day from as many different plants as possible, include bitter and liver-supporting foods, and give your nervous system a daily reset. None require a supplement cabinet. Depending on the concern, changes can show up anywhere from a few weeks to several months.
Want the version tailored to your skin? Skip to your takeaway by skin concern.
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Why your gut shows up on your face
What happens in the gut doesn't stay in the gut.
Your digestive tract is where food becomes nutrients, where hormones get processed, and where the majority of your immune system lives. When that system is inflamed or poorly fed, the signal travels. Researchers call this the gut-skin axis — the two-way conversation between your gut microbiome and your skin.
The most useful part of that conversation is a family of compounds called short-chain fatty acids (SCFAs). When you eat fibre, beneficial microbes in your colon ferment it into butyrate, acetate and propionate. These are anti-inflammatory: they fuel the cells lining your gut, help keep the gut barrier intact, and there's growing evidence they support skin barrier integrity and calm inflammatory skin conditions from the inside. You can't make them without fibre — and you can't absorb the nutrients skin needs if digestion isn't working upstream.
At Byra we build our formulas around plant-derived actives and skin nutrition, because topical care and what's on your plate are two halves of the same system. Here's the half that starts in the kitchen.
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Habit 1: Chew your food — properly
It sounds too basic to matter. It isn't.
Digestion is top-down. You see and smell food, you salivate, and saliva enzymes begin breaking down carbohydrates before anything reaches your stomach. Thorough chewing then triggers the cascade: stomach acid, pancreatic enzymes, bile release.
Skip it and partially broken-down food enters a system that isn't primed for it. Larger, intact protein fragments are more likely to provoke an immune response — especially if your gut barrier is already compromised. That response is inflammation, and inflammation shows up as a flare.
Aim for 20–25 chews per mouthful. Your stomach doesn't have teeth.
Start today:
- Put your cutlery down between mouthfuls
- Sit down to eat — no car, no desk, no standing at the counter
- Take three slow breaths before your first bite
- Give each meal 15 minutes minimum
Stress at the table matters too. Your body can't distinguish traffic from a genuine threat - either way it diverts resources away from digestion. A rushed meal is a poorly digested meal.
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Habit 2: Balance your blood sugar at every meal
This is the single fastest lever for acne.
Eat carbohydrates alone - toast, cereal, a plain sandwich — and glucose rises quickly with insulin behind it. Elevated insulin increases the amount of free insulin-like growth factor 1 (IGF-1) in circulation, and IGF-1 stimulates sebum production and cell proliferation in the pore. That's the mechanism linking high-glycaemic diets to acne, and small randomised trials support it: low-glycaemic-load diets improve acne severity and reduce IGF-1.
The fix isn't restriction. It's addition. Add protein, healthy fat and fibre to whatever carbohydrate you're already eating.
| Instead of | Try |
|---|---|
| Toast alone | Toast + avocado + eggs |
| Porridge with honey | Porridge + nuts, seeds, berries |
| Fruit as a snack | Fruit + almonds or nut butter |
| Pasta on its own | Pasta + protein + side salad |
In one clinical case reported by a functional medicine practitioner, acne improved visibly over three weeks from two changes alone: blood-sugar-balanced meals and more liver-supporting plants.
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Habit 3: Eat 30g of fibre a day — and chase diversity
Fibre feeds the microbes that make your anti-inflammatory SCFAs, and diversity beats volume. Different fibres feed different microbes, which produce different beneficial compounds. Beta-glucans in oats and mushrooms support immune balance. Resistant starch — created when you cook then cool potatoes, rice or pasta, or freeze your bread — passes through undigested, feeding your microbiome while blunting the glucose spike.
Surprising high-fibre foods: dark chocolate at 70–85% (a genuine high-fibre plant food, plus polyphenols), avocado (around 5g in half a fruit), raspberries, beans and pulses (5–6g per 80g portion), and both coffee and matcha.
Start today:
- Increase gradually. Going from 10g to 30g overnight is how you end up bloated and convinced fibre isn't for you.
- Aim for 30+ different plants a week — herbs, spices, nuts and seeds all count.
- Hydrate. Fibre without fluid moves badly.
- Struggling with beans? Rinse tinned ones, cook dried beans with a strip of kombu, add cumin, and start with a spoonful.
Feeding your gut microbiome pairs naturally with supporting your skin's. Our PURIFY Biotic Cleanser is built with pre- and postbiotics and bearberry extract precisely because cleansing shouldn't strip the microbial balance you're working to build.
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Habit 4: Add bitters and liver-supporting foods
Bitter is the taste modern diets have lost. It's also the one that switches digestion on.
Bitter foods stimulate digestive juices and bile flow. Bile breaks down fats and enables absorption of fat-soluble vitamins A, D, E and K — all of which matter for skin. Meanwhile your liver processes hormones and clears what the body needs to eliminate. When elimination is sluggish, the burden tends to show elsewhere.
Foods to add: rocket, watercress, kale, chicory, endive, extra virgin olive oil, apple cider vinegar, turmeric, saffron, ginger, olives, artichoke, nettle tea, chicory root coffee, chamomile, berries.
Start today: build a two-minute starter salad — rocket or watercress, a drizzle of extra virgin olive oil, a splash of apple cider vinegar. Eat it before your main course, the way antipasti and mezze have worked for centuries.
Also watch your bowel habits. Regular, comfortable bowel movements are a foundation. If you're going fewer than three times a week, or straining when you do, more fibre, more water and a daily walk are the first three things to try.
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Habit 5: Give your nervous system a daily reset
Stress isn't optional. Your response to it is trainable.
Chronic stress diverts blood flow away from digestion, disrupts normal gut motility, alters the microbiome and contributes to systemic inflammation. It's also among the most consistently reported triggers for eczema and psoriasis flares. You can't out-supplement a dysregulated nervous system.
The aim isn't an hour-long practice nobody sustains. It's micro-habits, repeated:
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Humming, 90 seconds. Hand on chest, eyes closed — it’s thought to work on the vagus nerve, and most people feel the shift.
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Three deep breaths before every meal. Free, instant, and it shifts you into the state your digestion works best in.
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Gratitude journaling, three lines before bed.
- A 20-minute walk after your largest meal — helps bloating and blood sugar at once.
Ritual matters here. Skincare is one of the few daily routines already built for slowness — which is why Deep Calm Eau de Parfum is part of our range. Scent is a powerful anchor for a routine you’ll actually repeat.
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Your takeaway by skin concern
All five habits help everyone. But if you change one thing this week, start here.
If you have acne
Start with Habit 2 — blood sugar balance. Never eat a carbohydrate naked; add protein and fat to every meal and cut back on sugary drinks. Then layer in fibre and liver-supporting greens.
Topically: for post-acne marks and uneven tone, ILLUMINATE Nutri-Serum Concentrate combines alpha arbutin, vitamin C and niacinamide. For the look of congestion and uneven texture, MERACLE Nutri-Essence Treatment Enhancer supports gentle surface renewal.
If you have eczema
Start with Habits 1 and 5 — chewing and nervous system support. Poorly broken-down proteins plus a stressed system is the combination most likely to keep the immune response switched on. Build fibre slowly, and notice whether high-histamine foods (aged foods, leftovers, fermented foods, strawberries) track with your flares. Watercress, moringa, ginger, turmeric, nettle and chamomile are supportive alternatives.
Important: eczema is genuinely individual — five people with the same diagnosis can have five different drivers. See your GP or dermatologist first. This complements medical care, it doesn't replace it.
Topically: whatever your prescribed treatment, choose everyday products that support the skin barrier rather than strip it. SATURATE Nutri-Moisturiser is formulated with snow mushroom polysaccharides and peptides for sustained hydration. It’s cosmetic skincare, not a treatment for eczema.
If you have psoriasis
Start with Habit 5 alongside the food foundations. Psoriasis is autoimmune, so the realistic goal is remission rather than cure — and stress is a well-documented flare trigger. Give the foundations a few months before considering deeper investigation with a qualified practitioner.
Topically: alongside whatever your dermatologist has prescribed, gentle non-stripping cleansing is a sensible everyday base — PURIFY Biotic Cleanser followed by SATURATE. Neither is a treatment for psoriasis.
If your skin is dull or congested
Start with Habit 4 — bitters and liver support. Better bile flow means better absorption of fats and fat-soluble vitamins. Then eat the rainbow, literally: colour is where antioxidant status comes from.
Topically: MERACLE Nutri-Essence Treatment Enhancer for renewal, then ILLUMINATE for clarity — with PURIFY, the three make up our Skin Brightening Trio.
If your concern is firmness and early ageing
Start with Habit 3 — fibre and plant diversity. Emerging research links gut-derived SCFAs to skin barrier function and skin ageing pathways. Add adequate protein at each meal, since collagen is built from amino acids you actually absorb — which loops back to Habit 1.
Topically: REJUVENATE Nutri-Serum Concentrate with bakuchiol and hyaluronic acid, a gentler route to renewal than retinol. Paired in our Skin Firming Trio.
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What if the habits aren't enough?
Give them a proper run — two to three months, consistently. If your skin is still struggling, see your GP first; useful baseline bloods include vitamin D, iron, thyroid, liver function and a full blood count. After that, a qualified nutrition or functional medicine practitioner can help. Stool testing can add useful information when an experienced practitioner interprets it. Food sensitivity (IgG) testing is more contested — allergy bodies don’t recognise it as diagnostic, and self-ordered tests are a common route into unnecessary food restriction, the opposite of the diversity your microbiome needs.
Go slowly throughout. Feeling terrible isn't a sign something is working. And the principle underneath all of it: it's never about taking out. It's about putting in.
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Frequently asked questions
How long does it take for gut health changes to show in your skin? It depends on the concern. Acne linked to blood sugar can shift in as little as three weeks. Eczema and psoriasis typically take months — in one clinical case described by a functional medicine practitioner, moderate-to-severe facial eczema took around eight months to clear with a consistent gut-focused approach.
Can gut health really cause acne? Gut health influences acne through blood sugar and insulin signalling, systemic inflammation, and nutrient absorption. It's rarely the only factor, but for many people it's a significant and modifiable one.
How much fibre do I need for good skin? At least 30g a day, and 30 or more different plant foods a week. Increase gradually to avoid bloating, and drink enough water alongside it.
Should I cut out dairy or gluten for my skin? Not as a first step. Blanket elimination narrows your diet and can worsen the microbial diversity you're trying to build. Fix the foundations first. If you still suspect a specific food, work with a practitioner rather than testing and eliminating alone.
What are the best foods for clear skin? Bitter greens (rocket, watercress, chicory), extra virgin olive oil, berries, oily fish, beans and pulses, nuts and seeds, turmeric and ginger, 70–85% dark chocolate, and fermented foods if you tolerate them.
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The bottom line
You don't need a protocol. You need five habits, done consistently, in the order that suits your skin. Chew. Balance your plate. Feed your microbes. Add bitters. Calm your nervous system.
At Byra we formulate clinical-grade, EWG-verified, plant-derived skincare because skin performance is built from both directions — nutrition in, formulation on. To go deeper on the food side, Naked Skin Nutrition: Feed Your Glow is the book we recommend to anyone starting this journey.
Explore the Byra range at byrabeauty.com →
This article is for educational purposes and is not medical advice. If you have a persistent or severe skin condition, see your GP or dermatologist for diagnosis before making significant dietary changes. Byra products are cosmetic skincare and are not intended to diagnose, treat or cure any condition.
