For acne-prone people, giving up milk and yoghurt often feels like a lifelong punishment. But Canada-based nutritionist Sisley Killam, founder of The Acne Nutritionist, says the real solution may not be eliminating dairy — but switching to the right type.
In an Instagram post shared on January 9, Sisley challenged the idea that all dairy is bad for skin. According to her, the acne-triggering culprit is not lactose, but a milk protein known as A1 casein.
A1 vs A2: The Real Dairy Divide
Sisley explained that originally, all cows produced A2 casein. However, a genetic mutation that occurred in European herds thousands of years ago introduced the A1 variant. Due to selective breeding for higher milk yields, A1 milk has become the dominant type in North America and many Western countries.
“A1 dairy is harder to digest, increases gut permeability, stimulates immune reactions, and can cause more inflammation,” Sisley said. These effects, she added, are major contributors to hormonal and cystic acne.
Why Dairy Feels Easier on Your Skin in Europe
Many travellers notice that their skin stays clearer when consuming dairy abroad. Sisley said this is because traditional cow breeds in Asia, Africa, and parts of Europe, along with Jersey cows, are more likely to carry the original A2 gene.
Read More: Odisha CM Warns Cattle Smugglers, Urges Farmers to Embrace Dairy
“This is one of the reasons why when we travel to Europe and eat dairy daily, we tend to have no digestive or skin issues,” she said.
For people who believe they are lactose intolerant, Sisley suggested the problem might actually be A1 casein intolerance, not lactose itself.
The A2-Friendly Shopping List
To reintroduce dairy without triggering breakouts, Sisley recommended choosing products that naturally contain A2 proteins or better fat profiles:
- Water buffalo dairy: Buffalo yoghurt, buffalo mozzarella
- Sheep milk products: Pecorino Romano, Manchego (Parmesan is often well-tolerated)
- Goat dairy: Goat kefir, yoghurt, and cheese
- A2 cow dairy: Grass-fed organic A2 milk, butter, and yoghurt
- European imports: European cheeses and butters if local A2 options are limited
The Nutritional Upside of “Good” Dairy
Sisley stressed that high-quality dairy is far from junk food. She said it is a strong source of vitamin A, which helps regulate skin cell turnover and supports clearer skin.
“Dairy can be a great source of healthy fats and nutrients,” she said, adding: “It’s all about the quality, type, and sourcing.”
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