Full-Fat Dairy Study Finds No Weight or Cholesterol Gain
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- Harvey Anderson, a University of Toronto nutritional sciences professor, led a 12-week randomized study published in The Journal of Nutrition that found three daily servings of full-fat dairy produced no meaningful increases in weight, body fat, cholesterol, or insulin resistance.
- The 74-participant trial assigned adults with overweight or obesity to one of three diets — a low-dairy calorie-restricted plan, an energy-neutral plan with three daily dairy servings, and an unrestricted plan with three daily dairy servings — all guided by Canada's food guide.
- Participants eating three daily dairy servings showed improved blood pressure and consumed more calcium, protein, and vitamin D than the low-dairy group, with no adverse lipid or cholesterol readings.
- The dairy matrix hypothesis — that casein and whey proteins bound with fat and nutrients allow gradual nutrient delivery — may explain why dairy's effects differ from predictions based on saturated fat content alone.
- Anderson said the findings are particularly relevant for older adults, who often struggle to meet protein and nutrient needs on lower calorie intake, framing dairy as a practical option without raising diabetes or chronic disease risk.
- Related research by Temerty Medicine professor Kozeta Milliku has previously linked full-fat dairy to positive or protective health effects, supporting the current findings.
- Funding came from Dairy Research Cluster 3 under the Canadian Agricultural Partnership AgriScience Program and the Mitacs Accelerate program.
Why it matters: With 74 adults tracked over 12 weeks across three dietary arms, this study directly contradicts the decades-long guidance in Canada and elsewhere to choose fat-free or low-fat dairy to limit saturated fat. For older adults specifically — a population already at risk of under-consuming protein and key micronutrients — the findings argue full-fat dairy can be a practical tool for meeting nutritional needs without the feared cardiometabolic trade-offs.
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