A 2026 systematic review and meta-analysis published in Nutrition Research examined trans fats that occur naturally in dairy foods, including studies comparing regular dairy with products containing higher concentrations of these fats.

According to Yahoo Health, which reported the findings, the researchers found no evidence that eating dairy foods was associated with an increased risk of cardiovascular disease or type 2 diabetes.

Increasing these naturally occurring fats through dairy did not significantly worsen most blood lipid markers measured, including LDL cholesterol and triglycerides.

Trans fat has been a nutrition-label red flag for good reason, but the new analysis highlights a crucial distinction the label can obscure.

Industrially produced trans fats, created by partial hydrogenation for packaged pastries, crackers and fried foods, were consistently linked to higher LDL, lower HDL and greater heart disease risk, leading the FDA to declare partially hydrogenated oils no longer generally safe in 2015, with most uses phased out by 2018.

Naturally occurring trans fats, such as vaccenic acid in milk, cheese, butter and beef, are chemically different compounds formed by bacteria in the stomachs of cows and sheep, and they may not carry the same effects.

The long-term studies were encouraging: researchers found no association between dairy-related trans fat markers and cardiovascular disease, cardiovascular mortality, or type 2 diabetes, and some studies even found associations with a lower diabetes risk.

Yahoo Health cautions that the evidence remains mixed, however, and it is too early to say these fats protect against diabetes.

Researchers also point to the food matrix: dairy delivers protein, calcium, potassium, phosphorus and other bioactive compounds together, so the health effect of a food cannot be predicted from a single nutrient on its label.

The finding arrives as diabetes prevention is gaining urgency: Newswise reports a nearly 50% increase in type 2 diabetes among women under 40 between 2017 and 2024, and Mercy Medical Center's Dr. Jonathan D. Rich advises a Mediterranean diet, 150 minutes of weekly exercise, sufficient sleep and lower stress to manage or prevent the disease.

Neither review gives a free pass to unlimited butter or red meat, since dairy still contains saturated fat, and the 2025–2030 Dietary Guidelines recommend about three dairy servings daily in a 2,000-calorie pattern. The takeaway is to judge whole foods by their overall pattern, not one label line.