Canadian Study Challenges Dairy Recommendations

Overview of the Study

A recent Canadian study published in The Lancet has explored the relationship between dairy consumption and cardiovascular disease as well as mortality rates, suggesting that the health benefits of dairy may be underestimated.

Common Dietary Advice

Many individuals have likely encountered the suggestion to eliminate butter from their lobster-dipping sauce or to choose skim milk for their coffee. Such recommendations often come from nutritionists or well-meaning friends and family, emphasizing a shift toward low-fat dairy products over whole-fat options like milk, yogurt, butter, and cheese.

Reason Behind Dietary Recommendations

The rationale for these suggestions is rooted in the belief that dairy products are significant sources of saturated fats, which may contribute to higher levels of cholesterol and an increased risk of cardiovascular disease and mortality.

Findings from McMaster University

Contrary to prevalent guidelines, a study conducted by McMaster University in Canada examined the health implications of dairy consumption. The research analyzed data from approximately 130,000 individuals aged 35 to 70 across 21 countries on five continents. Participants reported their intake of both whole-fat and low-fat dairy products through questionnaires, as part of The Prospective Urban Rural Epidemiology (PURE) study. This study tracked participants for up to nine years or until death occurred from natural causes or heart disease.

Key Results

The findings indicated that consuming three servings of whole-fat milk or yogurt daily is associated with cardiovascular health benefits, including a reduced risk of stroke and mortality. Notably, researchers did not observe a correlation between higher dairy intake and heart attack incidents. The authors of the study stated, “findings support that consumption of dairy products might be beneficial for mortality and cardiovascular disease, especially in low-income and middle-income countries where dairy consumption is low.”

Critique of Current Dietary Guidelines

The authors expressed concern that current dietary guidelines promote fat-free or low-fat dairy options based on the perceived dangers of saturated fatty acids affecting LDL cholesterol levels. They argued that due to the diversity of dairy products, health impacts cannot be solely assessed by one factor, such as saturated fat content.

Limitations and Future Research

One notable limitation of the study was the lack of supervision regarding participants’ reported dairy intake. Despite this, the research suggests that dairy may be associated with a lower risk of cardiovascular disease and mortality. While further studies are necessary to confirm these findings, consumers may feel less apprehensive about purchasing whole-fat yogurt in the future.

Conclusion

This study, authored by Marina Chemerovski-Glikman, PhD, highlights the potential health benefits of dairy and questions longstanding dietary recommendations.

Reference

Dehghan M, Mente A, Rangarajan S, Sheridan P, Mohan V, Iqbal R et al. Association of dairy intake with cardiovascular disease and mortality in 21 countries from five continents (PURE): a prospective cohort study. The Lancet. 2018.