Study Reveals Natural Trans Fats in Dairy May Not Harm Health
A recent study published in Nutrition Research suggests that naturally occurring trans fats in dairy products such as milk, butter, cheese, and yogurt do not negatively impact heart health or increase the risk of type 2 diabetes. This finding distinguishes these natural trans fats from industrial trans fats, which have been associated with adverse health effects.
Trans fats are a type of unsaturated fat, with two primary kinds identified. The first kind, industrial trans fats, are produced through partial hydrogenation and have been linked to higher levels of harmful cholesterol and an increased risk of heart attack and stroke. As a result, many countries have restricted or banned these fats.
The second type of trans fats occurs naturally in dairy products and the meat of ruminant animals like cows, sheep, and goats. These fats are produced by bacteria in the animals' stomachs. Despite sharing the same name, the effects of natural trans fats on the human body have been questioned.
To investigate further, researchers analyzed data from 22 scientific studies involving thousands of participants in Europe, Canada, and the United States. The study reviewed 10 controlled dietary studies and 12 large population studies. The controlled studies compared the effects of consuming dairy products with higher natural trans fat levels against those with regular levels, measuring blood fats such as cholesterol. The population studies monitored participants' health outcomes over many years in relation to their blood levels of dairy trans fats.
The analysis revealed that higher consumption of natural dairy trans fats did not lead to increased risks of heart disease, stroke, cardiovascular mortality, or type 2 diabetes. Professor Ian Givens of the University of Reading noted that these findings support the idea that natural dairy trans fats differ significantly from industrial trans fats.
Despite these findings, experts caution against consuming excessive amounts of butter or cheese, as dairy products can still be high in saturated fat and calories. They are best consumed as part of a balanced diet rich in fruits, vegetables, whole grains, beans, nuts, and healthy protein sources.
This comprehensive review provides robust evidence by combining results from controlled feeding trials and long-term observational studies. While the study does not prove that natural dairy trans fats actively protect health, it does indicate they do not increase the risk of the studied diseases.
