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Acne: what works, and what food has to do with it

Acne is a follicle problem, not a hygiene problem. Which ingredient targets which part of it, what the diet evidence actually supports — low glycaemic load and skim milk yes, chocolate and greasy food no — and the specific signs that mean it needs a clinician rather than another product.

This page explains what acne is and what the evidence supports. It does not diagnose you, it does not prescribe, and it does not replace a pharmacist or a doctor. Deep painful lumps, scarring, or acne that is affecting your life are reasons to be seen, not reasons to try another product.

What acne actually is

Four things happen in the same follicle. The lining sheds cells faster and they stick together, forming a plug. The gland below it produces more sebum, driven mainly by androgens, which is why acne arrives with puberty and can flare with the menstrual cycle. Cutibacterium acnes, a bacterium that lives on everyone's skin, multiplies in the plugged, oxygen-poor follicle. And the immune system reacts, which is the redness, the swelling and the pain.

That four-part mechanism explains almost every sensible piece of advice about acne. A blackhead is a plug open to the air, oxidised — not trapped dirt. A treatment has to prevent the next plug rather than empty the current one, which is why it goes on the whole area and why it takes weeks. And an inflamed spot leaves a brown or red mark that can last months after the spot itself has gone, which is a pigment problem needing a different tool.

Which ingredient targets which part

Match the tool to the type. Blackheads and small bumps without redness are a plugging problem. Red, sore, pus-filled spots are an inflammation and bacteria problem. Brown marks left behind are a pigment problem, and treating them as if they were acne achieves nothing.

Do not run all of these at once. Stacking a retinoid, an acid and benzoyl peroxide in the same week is how people arrive at a raw, stinging face, stop everything, and conclude that nothing works. One active, one change at a time, eight weeks each.

What food has to do with it

The honest summary is that diet matters less than the internet says and more than dermatology said twenty years ago. Two dietary associations have survived scrutiny; the famous ones have not.

Glycaemic load Moderate evidence

This is the best-supported dietary link. Randomised trials of low-glycaemic-load diets have shown improvement in acne severity compared with the usual diet, and there is a plausible mechanism: a large, fast rise in blood glucose raises insulin and insulin-like growth factor signalling, which increases androgen activity and sebum production. The practical version is not a special diet — it is fewer sugary drinks, less white bread and confectionery, and more of the meal built on protein, fibre and fat. Our glycaemic load reference shows which foods carry the load.

Milk, especially skim milk Association only

Cohort studies repeatedly find more acne among people who drink more milk, and the association is oddly strongest for skim and low-fat milk. The proposed mechanism involves the hormones and growth factors present in milk, and the fact that removing the fat concentrates the rest. No trial has shown that stopping milk clears acne. Cutting back is harmless; cutting dairy out entirely during adolescence has real costs for calcium and protein and should not be done casually.

Whey protein supplements Weak evidence

Case series and clinical reports describe acne appearing or worsening with whey protein supplementation, particularly in young men who started training and supplementing at the same time. The evidence is low quality but the pattern is consistent enough to be worth knowing: if acne arrived within a couple of months of starting a whey supplement, stopping it for eight weeks is a cheap test. See the supplements reference for what protein powders are and are not for.

Chocolate, greasy food and dirt Not supported

Eating fat does not put oil in your follicles; sebum is made in the gland from scratch. The chocolate studies are small and methodologically poor in both directions. And acne is not a hygiene failure — the plug forms below the surface, where a cleanser has never reached. Telling a teenager to wash more is both wrong and unkind.

Zinc Limited, and not first-line

Oral zinc has been studied in inflammatory acne with modest results, at doses that commonly cause nausea and that interfere with copper absorption over time. It is not a first-line treatment and it is not a supplement to start on your own. Zinc's clearer skin role is the other way round: severe deficiency causes a characteristic rash, which is a medical diagnosis. The foods highest in zinc are the sensible route to enough of it.

When to stop treating it yourself

• Deep, painful lumps under the skin, or any scarring. Scarring is permanent and the window to prevent it is now, not after another year of trying products.
• No real improvement after about three months of consistent, correct use of an over-the-counter treatment.
• It is making you miserable. Distress out of proportion to how it looks to others is a medical reason to be seen, not a personal failing.
• It started suddenly in adulthood, or came with irregular periods, new coarse hair growth or hair thinning — that combination is worth investigating rather than covering.
• It started after a new medicine. Several drug classes cause acne-like eruptions; do not stop a prescribed medicine yourself, but do tell the prescriber.
• Any acne in a young child, which needs assessment rather than a shop-bought product.

Isotretinoin, the strong oral retinoid used for severe acne, is a specialist medicine with mandatory pregnancy-prevention requirements and monitoring. It works, and it is also the single most important medicine on this page never to buy from an online seller.

Sources: EU Cosmetics Regulation (EC) No 1223/2009 and its annexes, as published in the European Commission's CosIng database, for every statement about what is permitted, restricted or banned · opinions of the Scientific Committee on Consumer Safety (SCCS) and safety assessments of the Cosmetic Ingredient Review (CIR) for the concentration positions · standard dermatology reference material for mechanism, tolerability and contact-allergy patterns · checked 2026-09-06. Deep links are deliberately omitted where a stable public URL could not be confirmed.

Diet statements above reflect the state of the published evidence as summarised in dermatology guidance: randomised trials for glycaemic load, observational cohorts for milk, and case-level reports for whey protein. Where the evidence is only an association, the page says so.

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