Study Finds Dairy Trans Fats Do Not Increase Heart Disease or Diabetes Risk

A new study indicates that the trans fats naturally present in dairy foods, including milk, butter, and cheese, do not increase the risk of heart disease or type 2 diabetes. Researchers conducted a comprehensive review of evidence from 22 studies involving thousands of participants across Europe, Canada, and the United States. Their findings suggest that the naturally occurring dairy trans fats behave differently in the body compared to industrial trans fats, which are strongly linked to heart disease. Professor Ian Givens from the University of Reading, one of the lead authors, emphasized that while the term 'trans fats' often carries negative connotations, the trans fats found in dairy products should not be viewed in the same light as those from industrial sources. This research aims to reassure consumers that dairy, when consumed as part of a balanced diet, is not detrimental to heart health. The study categorized trans fats into two types: those that occur naturally in the milk of animals such as cows and goats, and those produced artificially during the manufacturing of partially hydrogenated fats. The latter are commonly found in processed and fried foods and have been associated with an increased risk of heart disease. To assess the impact of dairy trans fats, researchers examined two primary types of evidence. The first consisted of ten controlled dietary trials where participants consumed dairy products with enhanced levels of natural trans fats, compared to those consuming regular dairy. Blood lipid biomarkers, which are indicators of heart disease risk, were measured. Results showed no significant differences in blood lipid levels between the two groups. The second type of evidence came from twelve long-term cohort studies that tracked thousands of individuals over several years, some extending beyond two decades. These studies measured dairy trans fat levels in participants' blood and correlated them with health outcomes. Findings revealed that higher levels of dairy trans fats did not correlate with an increased risk of heart disease, stroke, or cardiovascular mortality, nor were they associated with a higher likelihood of developing type 2 diabetes. This research, published in the journal Nutrition Research, aims to clarify the distinction between different types of trans fats and could influence labeling policies to reduce consumer confusion. The results provide a clearer understanding of how dairy consumption fits into a healthy diet without raising concerns about heart health.