Egg & # 39 is one of the most controversial among nutritionists food: after decades of research and debate about its impact on health, there is still no consensus on this issue in the scientific community.
While a few decades ago, the egg was not the number of healthy, and some researchers have referred to the "bad" cholesterol as a trigger for heart attacks factors negatively understanding softened with time, to the fact that in 2010 the United States Department of Health, established as a free risk doses up 300 mg of cholesterol per day, a little more than an egg containsEven the American Heart Association recommends that daily intake.
Yet so far, the latest edition of the dietary recommendations to remove all restrictions on the intake of this nutrient, claiming that there was no scientific basis to enhance the return.
However, a new study again embarrass the consumption of eggs. According to a report in the Journal of the American Medical Association, consuming 300 mg cholesterolper day This is due to the increase by 17% the risk of cardiovascular disease and 18% of the possibility of death from other causes. How many more eggs to eat, the higher the risk, she goes there.
But nothing of the & # 39 final. "If dietary cholesterol is associated with cardiovascular disease or death, it is subject to It was discussed for decades, Reported on the positive, negative and neutral associations. The literature is too contradictory and inconclusive and for experts and researchers in the field of nutrition and take out the conclusion to determine a & # 39 is eggs & # 39 are healthy or not, "said Victor the Zhong, co-author of the study and a postdoctoral researcher Feinberg School of Medicine (Northwestern University, USA), in electronic mail time.
In any case, before you approve or reject the eggs completely columnist for The New York Times and the issue of health expert, Jane Brody, she studied the shortcomings of past research and how it relates to current dietary guidelines and other preliminary studies.
Research data were analyzed from six prospective cohort studies carried out up to 31 years, which cover 29.615 adults, During this time they were recorded, including 5,400 cardiovascular events and 6,132 deaths from the causes of any order.
To analyze the relationship between cholesterol levels and the risk of cardiovascular disease and premature deathThe researchers focused on the consumption of eggs whose yolk contains this substance. The study showed that eating three or four eggs a week, is correlated with an increase in 6% and 8%Accordingly, in such danger.
Brody, for its part emphasizes that this is not a study of intervention, so we can not say for sure what would have happened if the participants rejected the food, replacing other edible.
"Several studies of interventions have shown that moderate consumption of eggs It does not increase the cholesterol level significantly"Frank Hu of all, an expert in the field of nutrition and epidemiology at the School of Public Health at Harvard University (USA).
"Low-moderate consumption of three or four eggs a week, it seems, has no significant effect on blood cholesterol levels, if the person has not already high cholesterol or type 2 diabetes"He said.
The expert noted that most previous studies in healthy people, moderate consumption of eggs I was not associated with a significantly increased risk cardiovascular disease.
Hu said that this is not a & # 39 is unusual, inconsistent data between different studies, which he called "Part of the scientific process"So, when making recommendations "should pay attention to the evidence in the full & # 39; volume, without overreact to new research."
To eat or not to eat?
Zachary Clayton, author of a comprehensive report on the consumption of eggs and heart health, published in the Journal of Nutrition in 2017, argues that the two eggs a day for 12 weeks, Sun increased cardiovascular risk factors in healthy people. In addition, this diet will lowering triglyceride levels (Fats).
According to the words of the postdoctoral researcher in nutrition at Colorado State University (USA), "it is important distinguish hiporrespondedores and hyperresponders dietary cholesterol. "
"If an overreaction, you eat two eggs a day, when you increase the risk of cardiovascular disease," he said.
Prior to the inclusion of eggs in the diet, expert suggests undergo a blood test and repeat after three or four weeks of moderate consumption, "to evaluate individual response to dietary cholesterol." If the results are within normal limits, there is no reason to believe that the food as a risk factor.
At the same time, ordinary consumers need to pay attention to Two other important aspects, First, other products dominate in your diet. Saturated fatty red meat and dairy products are not defatted They have a stronger effect cholesterol levels and cardiovascular risk that dietary cholesterol, Therefore, if one stands rich fruits and vegetables, fish and birds, and only rarely eat red meat include procesadas-, cheese and other foods rich in fat Mediterranean diet, will minimize concern about cholesterol yolk.
Second, the benefits of egg consumption. Despite the high levels of cholesterol, this food has a relatively low level of saturated fat. In addition, it an excellent source of essential nutrientsSuch as phosphorus, potassium, vitamins A, D and B group also contains high levels of lutein and zeaxanthin, a compound that helps prevent macular degeneration associated with age. Yolks finally the most concentrated source of choline, an essential component of brain development and a healthy nervous system.
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