Research suggests that dairy consumption may be associated with acne in some people, but the relationship is not fully understood. Dairy does not appear to cause acne in everyone, and current evidence does not support recommending that all people with acne avoid dairy.
What researchers have found
Studies have reported that some people who consume more dairy—particularly skim milk—have a higher likelihood of having acne. However, most of these studies show an association, not proof that dairy directly causes acne.
The strength of the association varies between studies, and not everyone experiences changes in their skin after consuming dairy.
Possible explanations
Researchers are investigating several ways dairy might influence acne in susceptible individuals:
- Hormonal effects: Milk naturally contains hormones and other biologically active compounds. Dairy consumption may also influence levels of insulin-like growth factor 1 (IGF-1), a hormone involved in cell growth that may increase oil (sebum) production and skin cell turnover.
- Insulin response: Some dairy products may increase insulin levels, which can affect pathways involved in acne development.
- Individual susceptibility: Genetics, hormone levels, and differences in skin biology may explain why dairy seems to affect some people but not others.
These mechanisms are still being studied, and no single explanation has been confirmed.
Does the type of dairy matter?
Some research has found a stronger association with skim milk than with whole milk, yogurt, or cheese. The reasons for this are not clear, and findings have not been entirely consistent across studies.
Fermented dairy products, such as yogurt, may have different effects than milk, but more research is needed before firm conclusions can be made.
Should you stop eating dairy?
For most people, routine elimination of dairy is not recommended solely to treat acne.
If you notice that your acne consistently worsens after consuming dairy, you could:
- Keep a food and symptom diary for several weeks.
- Look for a consistent pattern rather than isolated breakouts.
- Discuss your observations with a healthcare professional or registered dietitian before making significant dietary changes.
If you do reduce or eliminate dairy, it’s important to obtain enough calcium, vitamin D, and protein from other foods or supplements if recommended by your healthcare provider.
The bigger picture
Acne is influenced by many factors, including:
- Genetics
- Hormonal changes
- Oil production
- Inflammation
- Clogged pores
- Skin bacteria
Diet is just one potential contributor. For people whose acne is affected by dairy, dietary changes may provide some benefit, but they are generally most effective when combined with evidence-based acne treatments and a consistent skincare routine.
Overall, current evidence suggests that dairy may contribute to acne in some, but not all, individuals, and recommendations should be individualized rather than applied universally.
