Full-Fat Dairy May Be Healthier Than Long Believed, New Study Suggests

A 12-week Canadian study is challenging the long-standing assumption that choosing low-fat dairy is always the healthier option.

Researchers led by University of Toronto nutritional sciences professor Harvey Anderson found that adults who consumed three servings of full-fat dairy each day did not experience meaningful increases in body weight, body fat, blood cholesterol or insulin resistance during the study period.

What the Study Found

The randomized study involved 74 adults with overweight or obesity. Participants followed different dietary approaches, including groups that consumed three daily servings of full-fat dairy. After 12 weeks, researchers reported no meaningful differences in weight gain, body composition or cholesterol levels compared with participants following a lower-dairy diet.

Participants consuming more dairy also showed improvements in blood pressure and increased their intake of calcium, protein and vitamin D, according to the University of Toronto.

Why Full-Fat Dairy Has Been Questioned

Full-fat milk, yogurt and cheese contain saturated fat, which can raise LDL cholesterol when consumed in excess. For decades, many dietary recommendations therefore encouraged people to choose reduced-fat or fat-free dairy products.

However, researchers increasingly argue that foods should not always be judged by a single nutrient. The 'dairy matrix' hypothesis suggests that the combination and physical structure of protein, fat, minerals and other nutrients in dairy foods may influence how the body digests and responds to them.

Does This Mean Everyone Should Switch to Full-Fat Dairy?

Not necessarily. The study was relatively small, lasted only 12 weeks and focused on adults with overweight or obesity. It does not prove that full-fat dairy is healthier for everyone or that low-fat dairy is harmful.

Current cardiovascular guidance still emphasizes limiting excessive saturated-fat intake, particularly for people with elevated cholesterol or heart-disease risk. Individual dietary needs can also vary according to overall diet, health conditions and calorie requirements.

The Bigger Picture

The findings add to a growing body of research questioning the idea that full-fat dairy automatically leads to weight gain or poorer cardiometabolic health. They also underline the importance of considering whole foods and overall dietary patterns rather than focusing only on their fat content.

Key Takeaway

For many people, milk, yogurt and cheese can contribute valuable protein, calcium and other nutrients. The latest research suggests that full-fat varieties may fit into a balanced diet without necessarily worsening weight or cholesterol, but longer and larger studies are needed before broad conclusions can be drawn.