If you have acne, you have probably wondered whether what you eat is making it worse.
It’s one of the most common questions that comes up in clinic. Some people notice their skin flares after certain foods. Others feel like they’re doing everything “right”, but nothing seems to change.
The truth sits somewhere in between. Diet is not the sole cause of acne, but for some people, it can play a role. The challenge is working out whether it’s relevant for you.
Why has the link between diet and acne been so unclear?
For a long time, diet was not thought to matter much in acne.
Earlier studies suggested there was no clear connection, so dietary advice gradually disappeared from treatment plans. More recently, those studies have been re-examined and criticised for how they were designed.
As a result, interest in the link has returned. Newer research suggests that certain dietary patterns may influence acne in some individuals.
That doesn’t mean diet is the main cause, but it can act alongside hormones, genetics, and the way your skin behaves.
What does current research suggest?
The evidence is still evolving, and it’s not always straightforward.
There isn’t a single food that causes acne in everyone. However, some patterns are starting to emerge, particularly around foods that affect blood sugar and hormone levels.
The strongest links so far are with:
- high glycaemic index diets
- and, to a lesser extent, dairy
How do high glycaemic index foods affect acne?
Foods with a high glycaemic index, such as sugary snacks, soft drinks, white bread, and fast food, are absorbed quickly and can cause sharp rises in blood sugar.
This leads to increased levels of hormones such as insulin and insulin-like growth factor 1 (IGF-1).
These hormones can increase oil production in the skin and stimulate processes that contribute to acne.
Over time, this can make breakouts more frequent or more persistent.
Does dairy make acne worse?
The relationship between dairy and acne is less clear.
Some studies suggest there may be a link, particularly with skimmed milk, but the evidence is not consistent.
One theory is that dairy may influence hormone levels in a similar way to high glycaemic foods, or contain compounds that affect oil production in the skin.
That said, the evidence is not strong enough to recommend cutting out dairy for everyone.
What kind of diet is best for acne-prone skin?
There is no single “acne diet”, but some general principles seem to help.
A diet lower in refined sugars and processed carbohydrates, and higher in whole foods, may support healthier skin.
This might include:
- vegetables and fruit with a low glycaemic index
- whole grains
- oily fish rich in omega-3 fatty acids
- nuts, seeds, and legumes
These foods may help reduce inflammation and support more stable hormone levels, which can be beneficial for acne.
Should I change my diet if I have acne?
This really depends on the individual.
For some people, dietary changes can make a noticeable difference. For others, there may be little to no impact.
If you suspect a connection, it can be useful to track what you eat and how your skin responds over time. A simple food diary kept over several weeks can help reveal patterns that aren’t obvious day to day.
Can acne be treated with diet alone?
No.
Diet can sometimes help, but it should not replace medical treatment.
There are many well-established and effective treatments available, including topical creams, oral medications, and specialist therapies.
Diet works best as an additional measure alongside these treatments, rather than as a standalone solution.
When should I seek medical advice?
It’s worth speaking to a doctor or dermatologist if:
- your acne is persistent or getting worse
- you are starting to develop scarring
- over-the-counter treatments are not helping
- your skin is affecting your confidence or mental wellbeing
Acne is a complex condition, and diet is only one part of the picture. For some people, it plays a role. For others, it doesn’t.
Understanding your own patterns, and combining that with the right treatment, is usually the most effective way to manage it.
About the author
Dr Anjali Mahto is a London-based Consultant Dermatologist and cosmetic skin expert, specialising in acne, rosacea, and advanced non-surgical treatments. She is the bestselling author of The Skincare Bible and is known for combining evidence-based dermatology with a holistic, patient-focused approach to skin health.
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