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NewsNot all trans fats are created equal. A major review of 22 studies found that the naturally occurring trans fats in dairy foods — think milk, butter, yogurt, and cheese — don't raise the risk of heart disease or type 2 diabetes. Unlike their industrial counterparts found in processed foods, dairy trans fats appear to behave very differently in the body, giving consumers and clinicians reason to reconsider the blanket "trans fat = bad" narrative.
For years, "trans fat" has been a dietary villain — but a sweeping new review suggests it's time to make an important distinction. Researchers analyzed evidence from 22 studies conducted across Europe, Canada, and the United States and found that the trans fats naturally present in dairy foods like milk, butter, yogurt, and cheese do not increase the risk of heart disease or type 2 diabetes. The findings, published in Nutrition Research, challenge the one-size-fits-all stigma around trans fats.
The key difference lies in origin. Industrial trans fats — created during the manufacturing of partially hydrogenated oils and found in some processed and fried foods — are firmly linked to cardiovascular harm. Dairy trans fats, which occur naturally in the milk of cows, sheep, and goats, appear to act differently in the body and showed no meaningful negative effects on blood lipid levels or long-term health outcomes.
Why it matters: These findings could reshape dietary guidance and food labeling policies that currently group all trans fats together — potentially causing unnecessary concern around dairy consumption. For clinicians counseling patients on heart-healthy diets, this review offers reassurance that moderate dairy intake is unlikely to be a cardiovascular concern.
