Does Dairy Cause Acne?

If you have acne, you may have wondered whether dairy is making your skin worse. It is one of the most common questions people ask when they are trying to understand why their breakouts keep coming back. The honest answer is this: dairy does not directly cause acne in everyone, but research suggests it may contribute to acne symptoms in some people, especially those who are already prone to breakouts. Acne is rarely caused by one single food. It is usually influenced by a combination of hormones, inflammation, stress, blood sugar balance, gut health, genetics and lifestyle. However, for some people, dairy can be one piece of the puzzle.

What Does the Research Say About Dairy and Acne?

A large systematic review and meta-analysis found an association between dairy intake and acne in children, teenagers and young adults. This does not prove that dairy directly causes acne, but it does suggest there may be a relationship worth paying attention to (Juhl et al., 2018). Other research has also found a positive association between milk consumption and teenage acne, particularly with milk intake in adolescent girls (Adebamowo et al., 2006). More recent reviews have continued to suggest that dairy may be acne-promoting in some people, especially when combined with a typical Western diet that is higher in refined carbohydrates and high-glycaemic foods (Meixiong and Bhutani, 2022). In simple terms, the research does not say that everyone with acne must avoid dairy. But it does suggest that dairy may be worth investigating if your acne is persistent, inflamed or not improving despite a good skincare routine.

Why Might Dairy Affect Acne?

There are a few possible reasons why dairy may affect the skin.

1. Dairy may influence insulin and IGF-1

Milk can influence insulin and insulin-like growth factor 1, also known as IGF-1. These hormones are involved in growth, but they may also influence oil production, inflammation and the behaviour of skin cells involved in acne development (Melnik and Schmitz, 2009). Higher IGF-1 activity has been linked with increased sebum production and changes in the skin that may contribute to blocked pores and breakouts.

2. Skimmed milk may be more strongly linked

Interestingly, the link between dairy and acne appears stronger for skimmed or low-fat milk than for full-fat dairy in some studies. This may be because skimmed milk has a different hormonal and protein profile, although more research is needed.

3. Whey protein may trigger breakouts in some people

Whey protein is found in dairy and is also commonly used in protein powders. Some people notice acne flare-ups when using whey protein supplements, especially around the jawline, cheeks, back or chest. This does not mean protein powder is bad for everyone, but if your skin worsened after starting whey protein, it may be worth reviewing.

Is Cheese or Yoghurt as Bad as Milk?

Not all dairy appears to affect the skin in the same way. The strongest associations in the research are usually seen with milk, particularly skimmed milk. The evidence around cheese and yoghurt is less consistent. Fermented dairy products such as live yoghurt may affect the body differently because they can contain beneficial bacteria. For some people, yoghurt may be well tolerated. For others, it may still trigger symptoms. This is why it is important not to make blanket rules. Your skin, digestion, hormones and immune system all matter.

“When someone comes to me with acne, I don’t usually look at one food in isolation. Dairy can be a trigger for some people, but the bigger question is why the skin is reacting in the first place. That means looking at hormones, gut health, inflammation, stress, blood sugar balance and the person’s full diet.” — Beth, Nutritional Therapist

Should You Cut Out Dairy for Acne?

You do not need to cut out dairy forever just because you have acne. However, if you suspect dairy may be affecting your skin, a short, structured trial can be helpful. A sensible approach may include:

• Keeping a food and skin diary for 2–4 weeks
• Removing dairy for 4–6 weeks
• Monitoring changes in breakouts, redness and inflammation
• Reintroducing dairy gradually
• Noticing whether symptoms return

This gives you clearer information than guessing or cutting out multiple foods at once. If you do remove dairy, make sure your diet still contains enough calcium, iodine, protein and other key nutrients. This is especially important for teenagers, pregnant women, breastfeeding women and anyone with a restricted diet.

What Else Could Be Driving Acne?

Dairy may be one factor, but acne often has deeper root causes. Other common contributors include:

• Hormonal changes or imbalances
• High stress levels
• Poor sleep
• Blood sugar spikes
• Digestive issues
• Constipation or poor elimination
• Low intake of key nutrients such as zinc, omega-3 fats and vitamin A
• Inflammation in the body

This is why acne often improves most when you look beyond the surface of the skin. If you want to understand this in more detail, you may also find this article helpful: The Gut-Skin Axis: Why Your Skin Won’t Heal Until Your Gut Does.

So, Does Dairy Cause Acne?

Dairy does not cause acne for everyone. But for some people, especially those already prone to breakouts, milk and whey-based products may make acne worse. The key is not to panic or remove foods randomly. The best approach is to understand your personal triggers and look at the bigger picture of your health. If your acne keeps coming back, it may be a sign that your body needs support from the inside out.