Educational content: it does not replace ophthalmologic examination, diagnosis or prescribed therapies.

Microbiota and the gut–eye axis

What is microbiota

Gut microbiota is a complex ecosystem interacting with immunity and metabolism, influencing inflammation and mucosal barrier function.

Gut–eye axis

Dysbiosis and increased intestinal permeability (Leaky Gut) may contribute to low‑grade inflammation also involving ocular tissues.

More sensitive ocular diseases

Dry eye, ocular allergies/Vernal and some uveitis appear more sensitive to microbiota status in predisposed patients.

When to suspect a dysbiotic terrain

Intestinal signals

Bloating, irregular bowel habits and poor tolerance to dietary changes are common signs of dysbiosis.

Dysbiotic Phlogotype

In the Phlogotype model it is one of the background inflammatory drivers, alongside dysmetabolic, immunostress and degenerative terrains.

When it matters for the eye

Chronic and recurrent blepharitis, chalazia, dry eye and ocular allergies, especially in low‑fibre, ultra‑processed diets.

A broader overview of biological terrains is provided in the page Terrain Diets.

Fibers, prebiotics, probiotics and fermented foods

Fibers and prebiotics

Vegetables, fruits, legumes, whole grains, chicory, Jerusalem artichoke, garlic, onion and leeks support microbiota and SCFA production.

Probiotics (general remarks)

Live strains with documented benefits. Strain choice, dose and duration must be personalised with physicians, not self‑prescribed “for the eyes”.

Fermented foods

Plain yogurt, natural kefir and some fermented vegetables can complement diet cautiously, according to individual tolerance.

The aim is not to find a universal “probiotic for vision” but to improve gut terrain, reducing background inflammation that may affect the eye.

In-depth: Probiotics for eyes health

Discover the mechanisms of Leaky Gut and the specific targeted immunobiotics (e.g., L. Rhamnosus, Akkermansia) used for ocular modulation.

Dry eye disease

Core treatment remains ophthalmologist‑guided. A higher‑fiber, Omega‑3‑rich diet may support the gut–eye axis. → View Pathology

Ocular allergies and Vernal disease

Antihistamine drops remain essential. In selected patients, histamine load and microbiota modulation can be considered. → View Pathology

Blepharitis and recurrent chalazia

Alongside lid hygiene and ophthalmologic therapy, working on fibers and prebiotics may reduce recurrence. → View Pathology

These examples are not standard protocols. Strains, doses and duration require individual assessment and shared decisions with the care team.

MEDICAL DISCLAIMER

Nutritional information about microbiota does not replace clinical guidelines or prescribed ophthalmic therapies (eye drops, systemic drugs, laser, surgery).

Any modification of therapies, diets or supplements must be agreed upon with the Ophthalmologist, Primary Care Physician and, when indicated, Nutrition Specialist.

Key scientific references (Gut–Eye Axis, Dry Eye, ocular microbiome)

Unveiling the gut–eye axis: how microbial metabolites influence ocular health and disease. 2024.
Impact of microbiota on dry eye: literature review of the gut–eye axis. 2024.
Investigating the ocular surface microbiome: what can it tell us? 2023.
Methodologic considerations for studying the ocular surface microbiome. 2023.

Microbiota, Gut–Eye Axis and Probiotics