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The Gut and Skin Connection
- Posts promising "clear skin from the inside out."
- Your digestion and your skin both changed around the same time.
- You want to know what is real and what is marketing.
What doctors know for sure about the gut and the skin, what researchers are still studying, and the habits that make sense either way.
Updated November 8, 2026. Sources are listed under each section.
What doctors know for sure
Some digestive conditions can show up on the skin. Celiac disease is a clear example. The NIDDK says some people with celiac disease get dermatitis herpetiformis, an itchy, blistering skin rash that usually appears on the elbows, knees, buttocks, back, or scalp.
Among adults with untreated celiac disease, about 10 to 20 percent have this rash, and some people have the rash and no other symptoms. It's one reason a rash that comes with digestive symptoms is worth showing a doctor instead of guessing.
Sources
What researchers are still studying
Scientists are studying how the microbes that live in and on us interact with the skin. A 2024 review on the microbiota and the skin barrier in aging skin described this as an active area of research, and its authors wrote that more in-depth studies are needed.
So nobody can honestly promise that one food or one habit will change your skin.
Sources
Habits that make sense either way
The habits that help don't depend on how the gut-skin research turns out:
- For digestion: fiber added a little at a time, plenty of liquids, and some movement every day (NIDDK).
- For skin: short, warm showers, moisturizer on damp skin, and sunscreen outdoors, even in winter (AAD and MedlinePlus).
Sources
When to see a doctor
See your doctor if a rash comes along with digestive symptoms like bloating, chronic diarrhea, or weight loss. The NIDDK lists those among the digestive symptoms of celiac disease.
Don't cut out gluten before you're tested. The NIDDK says doctors don't recommend starting a gluten-free diet before testing, because it can affect the results. Doctors most often use blood tests and a biopsy of the small intestine.
And see a board-certified dermatologist for any spot that is new, changing, itching, or bleeding (AAD).
Sources
Questions for your appointment
Write your answers down, or bring this list to your next visit.
- Could my rash and my digestive symptoms be connected?
- Should I be tested for celiac disease before I change what I eat?
- Which of my skin changes are normal with age, and which should you check?
The free Gut & Skin Notebook has a full chapter on this connection: what is known, and what isn't yet.
Free guide · Gut & Skin
The Gut & Skin Notebook
A free guide for adults who want to understand their digestion and skin, and explain it clearly to a doctor.
Inside:
- The 4-column note that makes bloating easier to explain
- How digestion and skin can change with age, in plain English
- How to add fiber slowly, so your gut keeps up
- Dry-skin basics dermatologists recommend for fall and winter
- The gut-skin connection: what's known, and what isn't yet
- Signs that mean "call your doctor," and the screening that starts at 45
You'll get the guide right away on the next page. We may also email you short follow-ups on this topic, and some may include affiliate offers. We always say when a link earns us a commission. Unsubscribe anytime. Privacy
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- Bloating, constipation and refluxWhy digestion can change with age, and the signs that mean "call your doctor."
- Dry, itchy skinWhy skin gets drier with age, shower habits that help, and spots worth a check.