Dairy, and especially yoghurt and fermented products, has been consistently associated in observational research with a slightly lower risk of cardiovascular disease and better bone health. The fat content of dairy makes less difference than long believed, but the overall dietary pattern and population context are decisive. Causal evidence is largely absent.
Dairy and cardiovascular disease: a nuanced picture. Several large observational studies, including the international PURE study spanning 21 countries, find that higher dairy consumption is associated with a slightly lower risk of cardiovascular disease and mortality. A meta-analysis reports a 3.7% lower CVD risk and a 6% lower stroke risk with higher dairy intake. A systematic review of 108 studies on yoghurt and fermented dairy shows that 76 of those 108 studies found favourable outcomes, including less cardiovascular disease and a lower risk of type 2 diabetes. An important caveat: all of these findings are associations from observational research, not evidence of cause and effect.
Full-fat versus low-fat dairy: less difference than thought. Current evidence does not support a clear distinction in CVD risk between full-fat and low-fat dairy. Milk, yoghurt and cheese appear, regardless of their fat content, to be neutrally to slightly favourably associated with cardiovascular health. This may sound surprising, but researchers explain it through the 'food matrix': the complete composition of a product matters, not just its fat content. Note: one of the studies reaching this conclusion was co-funded by the dairy industry, which creates a vested interest in the outcome and requires critical reading.
The role of saturated fats remains a complicating factor. A diet that is generally rich in saturated fatty acids (SFA) raises LDL cholesterol, also known as 'bad cholesterol', and is associated with a higher risk of cardiovascular disease. Guidelines advise limiting SFA intake to less than 10% of daily calories, and even further for people with high cholesterol. At the same time, some studies argue that this cannot be translated one-to-one to specific products such as full-fat dairy, because the context of the overall dietary pattern and the food matrix also play a role.
Yoghurt and fermented dairy stand out positively. The systematic review shows consistent favourable associations with bone health, weight management and glucose metabolism, in addition to the previously mentioned cardiovascular health. Fermentation may provide additional health benefits through bacteria and bioactive substances, but here too causality has not been demonstrated.
Dairy in the context of the overall dietary pattern. The Mediterranean diet, which contains relatively little dairy and saturated fat but plenty of plant-based products and olive oil, has been shown through randomised trials to be strongly cardioprotective. The American Heart Association recommends low-fat or fat-free dairy as part of a heart-healthy dietary pattern. This makes clear that dairy in isolation is not the key: what matters is the complete dietary pattern. In some regions, such as China where predominantly full-fat milk is consumed, milk consumption is actually linked to a 9% higher risk of coronary heart disease, showing that context differs strongly by population.
Based on multiple meta-analyses, a large international cohort study (PURE, 21 countries), a systematic review of 108 studies, and guidelines from the American Heart Association. Almost all evidence on dairy and CVD is observational; causal evidence is scarce. One study has a financial interest from the dairy industry. The PMIDs used are: 39762253, 32447398, 40088974, 32562735, 34649831, 30223010, 30817261, 34724806.