Dairy foods have been getting a lot of attention from researchers in recent years, notably from studies done both jointly and separately by scientists at Harvard and Tufts universities. They looked at the relationship between full-fat dairy and the risks for heart disease and diabetes.
A 3,000-participant study found that people who included dairy fat in their diet had a lower risk of diabetes. One theory for the link is that people who skip or limit dairy might compensate by eating more refined, low-fiber carbohydrates, which can increase diabetes risk.
A study that followed more than 200,000 people over several decades looked at the relationship between dairy fat intake and heart disease.
It found no increase in heart disease risk among people who ate dairy fat, although the risk was lowered when calories from dairy fat were replaced with calories from plant-based fats or whole grains—24% when they were replaced by polyunsaturated fats and 28% when replaced with whole grains. On the other hand, the risk went up by 6% if those calories went instead to foods with other types of saturated fat, like red meat.
A third piece of research reviewed nine studies that looked specifically at butter, another source of saturated fat, and its role in heart disease, diabetes and all causes of death. The analysis found that while plant-based fats are healthier, small amounts of butter aren’t likely to hurt you.
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