Diet and acne: where the evidence stands

For decades the medical position on diet and acne was that there was no link, which turned out to be an overcorrection. There is a link. It is moderate rather than strong, and it implicates almost none of the foods Indian families actually blame.

This is information, not medical advice. Deep painful nodules or any indented scarring need a dermatologist, scarring is permanent. Do not eliminate food groups in a growing child without paediatric advice.

The mechanism, so the evidence makes sense

Acne involves four processes: increased sebum, abnormal shedding inside the follicle, Cutibacterium acnes, and inflammation.

Sebum production is driven largely by androgens, and androgen activity is influenced by insulin and IGF-1 (insulin-like growth factor 1).

That is the whole dietary pathway. Anything that raises insulin and IGF-1 can plausibly increase sebum and androgen activity.

And this immediately explains why the evidence points where it does, at things that raise insulin, not at things containing fat.

Where the evidence is reasonable

High glycaemic load diets

The best-supported dietary link.

Refined carbohydrate and sugar raise blood glucose quickly, which raises insulin and IGF-1. Several randomised trials of low glycaemic load diets have reported improvement in acne, alongside observational data.

Relevance to Indian diets is high, because the common offenders are everywhere: maida (biscuits, bread, bakery, noodles, samosa and kachori pastry), sugary drinks, sweets, and large quantities of white rice without protein or vegetables alongside.

And notice what this is not: it is not about fat or oil. A sweet biscuit is more implicated than a samosa’s oil, and that reversal is the useful insight.

Dairy, particularly skimmed milk

An association has been reported in multiple studies, more consistently for milk than for cheese or curd, and, counterintuitively, more strongly for skimmed than whole milk.

The proposed mechanism: hormones present in milk, and effects on IGF-1.

The limitation: most of this evidence is observational, so causation is not established, and the effect sizes are modest.

The skimmed-milk finding is interesting because it argues against fat being the problem and for something else in milk being relevant.

Whey protein supplements

Reported associations with acne flares, particularly in young men.

And this matters practically because gym-going, whey protein and the peak acne years coincide. If someone’s acne worsened within weeks of starting whey, that is worth a trial of stopping.

Note also: anabolic steroids cause severe acne on the back and chest, and that is a different and more serious issue in the same population.

Where the evidence is weak or absent

Oily and fried food, the big one

This is the most firmly held belief in India and the evidence does not support it.

Eating oil does not put oil in your skin. Sebum is synthesised by the sebaceous gland under hormonal control. It is not absorbed from the plate and delivered to your face.

What fried food often comes with is refined carbohydrate, the pastry, the batter, the bun, and that is the part with evidence. Which may be why the association feels real.

So the honest correction: it is not the oil in the samosa; it is the maida around it, and the soft drink with it.

Chocolate

Studied, with inconsistent results. Where there is a signal, the sugar is a more plausible culprit than the cocoa.

Spicy food

No evidence.

Nuts

No evidence. The belief that peanuts or almonds cause acne is not supported.

Garam vs thanda foods

The traditional hot/cold framing has no corresponding evidence in this context.

And the rest of the internet lists

Most of the long “avoid” lists circulating have no basis, and eliminating food groups has a real nutritional cost, particularly in adolescents who need the calories and protein.

Where it is genuinely uncertain

To be honest about the gaps:

Omega-3 and omega-6 balance, plausible on inflammatory grounds, with limited trial data.

Probiotics, some early interest, insufficient evidence.

Chocolate specifically, as above.

Iodine, an old hypothesis about high-iodine foods, never well substantiated.

Vitamin B12 and B6 at high doses, there are reports of acneiform eruptions with high-dose supplementation, which is worth knowing if someone’s acne began after starting a B-complex.

What a sensible trial looks like

Rather than eliminating everything at once:

1. Pick one change. Not five.

2. Give it 12 weeks. Acne responds slowly to anything. This is the step people skip, and it makes the whole exercise worthless.

3. Take photographs at the start and end, in consistent light. Memory is unreliable.

4. Change nothing else in that period, no new products, no new routine.

The two changes worth trying, in order:

Reduce sugar and refined carbohydrate. This has the best evidence, and it is good for you regardless of your skin.

Then, if that produced nothing, try reducing milk specifically for two to three months, keeping curd and paneer, since the evidence is weakest for those and they carry protein and calcium you need.

And do not eliminate dairy entirely without replacing the protein and calcium. In an adolescent, that is a real nutritional trade.

What matters more than diet

Being honest about the hierarchy, because diet is not the main lever.

Topical retinoid (adapalene), addresses the blocked follicle, which is the root process.

Benzoyl peroxide 2.5%, bacteria and inflammation.

Washing twice daily, not more, over-washing worsens acne.

Not picking, the mark that lasts six months is usually created by squeezing.

Sunscreen daily, because in Indian skin the lasting complaint is usually the dark mark, and sun exposure deepens and prolongs it.

Hair oil off the forehead, and no coconut oil on the face, both common Indian triggers with recognisable patterns.

And a dermatologist for deep painful nodules or any scarring, promptly.

Diet sits below all of these. Someone doing none of them and changing their diet is working on the smallest lever.

Two things to rule out

PCOS, in women, acne along the jawline and lower face with irregular periods, unwanted facial hair or scalp thinning warrants assessment. This is a hormonal cause, and diet advice alone misses it.

And an unidentified cream. Topical steroid misuse on the face is widespread in India and causes steroid-induced acne, often worse than the original. Any cream that cleared your skin within days is suspect, and stopping it abruptly causes a severe rebound, see a dermatologist to come off it.

On supplements, honestly

Zinc has some trial evidence in inflammatory acne, a modest, real effect. The upper limit is commonly cited around 40 mg/day of elemental zinc, and prolonged excess causes copper deficiency. A defined course, not indefinite.

Neem, manjistha and turmeric have traditional Indian use and plausible mechanisms; clinical trial evidence specifically for acne is limited.

Vitamin D deficiency is common in India and has been examined in relation to acne with mixed results. Worth testing anyway.

What is not supported: any supplement as a treatment for acne.

What we will and will not claim

We manufacture in this category, so the line matters.

What is sayable: traditional use of neem, manjistha and haridra in Ayurvedic skin formulations; zinc’s recognised role in normal skin maintenance; support for clearer-looking skin; cleansing.

What is not: treats acne, clears acne, or removes marks and scars. These are medicinal claims and we decline artwork that makes them.

And the specific thing we will not print: “avoid oily food” as skincare advice. It is the most widely believed claim in this category in India, it would make our copy feel familiar and credible to customers, and the evidence does not support it. Repeating it would also distract from sugar, which does have evidence.

The short version

1. The pathway is insulin and IGF-1 → androgens → sebum. That is why the evidence points at sugar rather than fat.
2. High glycaemic load, maida, sugary drinks, sweets, has the best support.
3. “Oily and fried food causes acne” is not supported. Eating oil does not put oil in your skin. It is the maida around the samosa, not the oil in it.
4. Dairy, especially skimmed milk, has a reported association, observational, modest, and stronger for milk than curd or cheese.
5. Whey protein has reported associations, relevant for young men who started it recently.
6. No evidence: spicy food, nuts, and most internet avoid-lists.
7. High-dose B12 and B6 can cause acneiform eruptions, worth knowing.
8. Try one change, give it 12 weeks, photograph it. Sugar first, then milk specifically.
9. Do not drop dairy entirely without replacing protein and calcium, especially in a teenager.
10. Diet sits below retinoids, benzoyl peroxide, not over-washing, not picking, and daily sunscreen.
11. Jawline acne with irregular periods, assess for PCOS.
12. A cream that worked in days is suspect, steroid-induced acne is common here.

Product detail: Glowo 360. Related: what actually causes acne, a simple routine, and zinc for acne.