A new study tries to answer those questions, but it also adds to the long-standing debate around eggs. The research, published in JAMA, says that the dietary cholesterol in eggs is associated with a heightened risk of cardiovascular disease and early death — even though the federal dietary guidelines, and plenty of nutrition experts, consider eggs part of a healthy diet. The most recent edition of the dietary guidelines even dropped its recommended cap on daily dietary cholesterol, citing a lack of evidence for a specific limit. (Previously, it was set at 300 milligrams per day, or a little less than the cholesterol content in two eggs.)
“Whether dietary cholesterol is associated with cardiovascular disease or death has been debated for decades. Positive, negative and [neutral] associations have been reported,” wrote study co-author Victor Wenze Zhong, a postdoctoral fellow in the department of preventive medicine at Northwestern University’s Feinberg School of Medicine, in an email to TIME. “The existing literature is still controversial and inconclusive for nutrition experts and researchers to conclude the safety of eggs.”
Conclusions about eggs based on available scientific evidence vary widely — in part because nutrition research is notoriously hard to conduct accurately. Despite the entrenched belief that eggs raise cholesterol, some studies have suggested that dietary cholesterol intake doesn’t necessarily translate to higher blood cholesterol. One study from last year found that people who ate an egg per day had lower rates of heart disease and bleeding stroke than people who did not eat them, and research from 2016 found that eggs didn’t have a strong effect on risk of coronary artery disease. Some researchers have suggested that links between egg consumption and health problems can largely be explained by the lifestyles of heavy egg eaters, since they may also be more likely to eat foods that are unhealthy for the heart and less likely to exercise regularly.
Zhong’s study, however, adjusted for many of these factors, and still found that eggs may be risky for health.
Zhong and his colleagues looked at data gathered from six different observational studies, which involved nearly 30,000 U.S. adults …read more
Source:: Time – Health