What happened
- A Canadian study led by Professor Harvey Anderson of the University of Toronto tested the effect of eating full-fat dairy for 12 weeks.
- Adults eating three daily servings of full-fat dairy showed no harmful changes in body weight, body composition, energy metabolism or blood cholesterol compared with a low-dairy diet.
- Those eating more dairy also improved blood pressure and obtained more of several important nutrients.
- The results were published in The Journal of Nutrition and ScienceDaily circulated them on 6 November 2026.
Why it matters
For decades, guidelines in Canada and many countries recommended low-fat or fat-free milk, yogurt and other dairy. The main worry was saturated fat, which can raise LDL cholesterol, linked to arterial deposits. The trial adds to evidence that full-fat dairy may not carry the expected risks. A food’s effect is not explained by one component alone: its matrix of proteins, calcium and other compounds can change the outcome.
The number
3 servings for 12 weeks. The daily dose the full-fat group ate without harmful changes in weight, body fat and cholesterol measures.
Context
Twelve weeks is short for talking about heart attacks or mortality, and the study measures intermediate variables such as cholesterol and blood pressure. A favorable result is a good sign but does not alone show long-term benefit. The text read gives neither participant numbers nor how results were adjusted for the rest of the diet. Related coverage: A crystalline hydrogel with 160 MPa tensile strength stays strong while fully hydrated, Mussels store vanadium and iron in separate systems to reinforce their adhesive, A hypothalamic RNA slows the age-related decline of sperm quality in mice, Codfishes lost an essential gene and recycled another to hydrate their eggs.
What’s next
- Longer studies with more participants are needed to see clinical outcomes.
- Nutrition guidelines may revisit the full-fat versus skim distinction if evidence repeats.
- The mechanism by which dairy fat does not produce the expected cholesterol effect remains to be explained.
Bottom line
A three-month controlled trial does not close the debate, but it challenges a recommendation repeated for decades on less direct evidence.
Sources
- ScienceDaily, “For decades, we were told to avoid full-fat dairy. New research says otherwise”, 6 November 2026, on a University of Toronto study in The Journal of Nutrition. The original paper was not read.
- Cover image: Maksym Kozlenko, CC BY-SA 4.0, via Wikimedia Commons
Edited by Rodrigo Cornejo. How we select and verify: who writes these notes.
