Dairy-rich diet linked to lower risks of diabetes and high blood pressure

Credit: CC0 Public Domain

Eating at least two daily servings of dairy is linked to lower risks of diabetes and high blood pressure, as well as the cluster of factors that heighten cardiovascular disease risk (metabolic syndrome), finds a large international study published online in BMJ Open Diabetes Research & Care.

The observed associations were strongest for full fat , the findings indicated.

Previously published research has suggested that higher intake is associated with a lower risk of diabetes, , and metabolic syndrome. But these studies have tended to focus on North America and Europe to the exclusion of other regions of the world.

To see whether these associations might also be found in a broader range of countries, the researchers drew on people taking part in the Prospective Urban Rural Epidemiology (PURE) study.

Participants were all aged between 35 and 70 and came from 21 countries: Argentina; Bangladesh; Brazil; Canada; Chile; China; Colombia; India; Iran; Malaysia; Palestine; Pakistan; Philippines, Poland; South Africa; Saudi Arabia; Sweden; Tanzania; Turkey; United Arab Emirates; and Zimbabwe.

Usual dietary intake over the previous 12 months was assessed by means of Food Frequency Questionnaires. Dairy products included milk, yogurt, yogurt drinks, cheese and dishes prepared with dairy products, and were classified as full or low fat (1-2%).

Butter and cream were assessed separately as these are not commonly eaten in some of the countries studied.

Information on personal medical history, use of prescription medicines, educational attainment, smoking and measurements of weight, height, waist circumference, blood pressure and fasting were also collected.

Data on all five components of the metabolic syndrome were available for nearly 113,000 people: blood pressure above 130/85 mm Hg; above 80 cm; low levels of (beneficial) high density cholesterol (less than 1-1.3 mmol/l); blood fats (triglycerides) of more than 1.7 mmol/dl; and fasting blood glucose of 5.5 mmol/l or more.

Average daily total dairy consumption was 179 g, with full fat accounting for around double the amount of low fat: 124.5+ vs 65 g.

Some 46, 667 people had metabolic syndrome—defined as having at least 3 of the 5 components.

Total dairy and full fat dairy, but not low fat dairy, were associated with a lower prevalence of most components of metabolic syndrome, with the size of the association greatest in those countries with normally low dairy intakes.

At least 2 servings a day of total dairy were associated with a 24% lower risk of metabolic syndrome, rising to 28% for full fat dairy alone, compared with no daily dairy intake.

The health of nearly 190,000 participants was tracked for an average of nine years, during which time 13,640 people developed high pressure and 5351 developed diabetes.

At least 2 servings a day of total dairy was associated with an 11-12% lower risk of both conditions, rising to a 13-14% lower risk for 3 daily servings. The associations were stronger for full fat than they were for low fat dairy.

This is an observational study, and as such can’t establish cause. Food frequency questionnaires are also subject to recall, and changes in metabolic syndrome weren’t measured over time, all of which may have influenced the findings.

Nevertheless, the researchers suggest: “If our findings are confirmed in sufficiently large and long term trials, then increasing dairy consumption may represent a feasible and low cost approach to reducing [], hypertension, diabetes, and ultimately cardiovascular disease events worldwide.”

Study finds yogurt, other dairy foods associated with better cardiometabolic health

More information:
Association of dairy consumption with metabolic syndrome, hypertension and diabetes in 147,812 individuals from 21 countries, BMJ Open Diabetes Research & Care, drc.bmj.com/lookup/doi/10.1136/bmjdrc-2019-000826

Dairy-rich diet linked to lower risks of diabetes and high blood pressure (2020, May 18)
retrieved 18 May 2020
from https://medicalxpress.com/news/2020-05-dairy-rich-diet-linked-diabetes-high.html

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