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06.03.2013 |
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Eggs not dangerous for heart and blood vessels
Eggs don't give you heart attacks and strokes, conclude nutritional scientists at Huazhong University of Science and Technology in China. They did a meta-study in which they collected existing data on half a million people and reanalysed it.
Eggs, cholesterol & cardiovascular disease
Studies were done that backed up this advice. The more eggs people eat, the higher the levels of bad cholesterol [LDL] in their blood, studies showed. From these studies [Am J Clin Nutr. 2001 May;73(5):885-91.] it was possible to calculate that for every whole egg per day that you eat (cholesterol is only present in the yolk) you raise your chance of having a heart attack by 2.1 percent.
Now 2.1 percent isn't so high, and a calculation is not scientific proof. And it looked for a while as though that proof would never be delivered. Meanwhile the arrival of statins and blood pressure reducing drugs brought interest in nutrition and cardiovascular disease down to nil in rich countries, and scientific research on the relationship between diet and cardiovascular disease ground to a halt.
Study
The Chinese researchers are no exception. They decided to collect all available epidemiological studies on the relationship between the consumption of eggs and the chance of developing cardiovascular disease. They then aggregated the data in these studies and reanalysed it.
The researchers found 17 studies that met with their approval, and these contained data on 474,342 people. Some of the studies concerned heart attacks [first figure below], others concerned strokes [second figure below].
Results
The Chinese discovered, however, that among diabetics a high intake of whole eggs does increase the risk of heart attack. Click on the summary table below to access the full information.
Conclusion
"Subgroup analyses suggest a positive association between higher egg intake and risk of coronary heart disease in diabetic patients, and an inverse association between higher egg consumption and incidence of hemorrhagic stroke. Studies with larger sample sizes and longer follow-up times are warranted to confirm these subgroup results."
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