The latest American research on eggs will not be easy for those who can not eat without them.
Adults who ate about 1 and half a day a day had a somewhat higher risk of heart disease than those who did not eat eggs. The study has shown that the more eggs, the greater the risk. Chances of early dying were also high.
Researchers say the culprit is cholesterol, which is found in egg yolks and other foods, including seafood, dairy products and red meat. The study focuses on eggs, because they are among the most cholesterol-rich foods most commonly consumed. Researchers can still be part of a healthy diet, but in smaller quantities than many Americans are used to.
US Difficult Guidelines UU. which facilitated cholesterol limits helped the eggs to recover.
The study has limitations and contradicts recent research but is likely to trigger a lengthy discussion of the egg again.
New results were published on Friday in the Journal of American Medical Association.
Researchers at the Feinberg Medical School at Northwestern University and elsewhere have taken the results of six previous studies, analyzing data from nearly 30,000 adults in the United States. UU. Participants were attended to an average of 17 years.
Researchers have calculated that those who ate 300 milligrams of cholesterol a day, about 1 and half an egg, had 17 percent more chance of developing heart disease than those who did not eat eggs.
Researchers based their conclusions on what the participants said to eat at the beginning of each study. They took into account high blood pressure, smoking, obesity and other features that could contribute to heart problems. There are risks with eggs and cholesterol in general; no separate analysis was conducted for each high-cholesterol food.
Dr. Bruce Lee, of Johns Hopkins University, said that dietary studies are often weak because they depend on how people remember what they are eating.
"We know that remembering a diet can be awful," Lee said. The new study offers only observation data, but it does not show that eggs and cholesterol have caused heart disease and death, said Lee, who was not involved in the study.
The chief author, Norrina Allen, a specialist in preventive medicine, said the study lacks information on whether the participants ate cooked, scrambled, fried or buttery scallops, which, as she said, could affect health risks.
Some people think that "I can eat as many eggs I want," but the results show that moderation is a better approach, he said.
Eggs are an important source of diet cholesterol, which was previously thought to be strongly associated with cholesterol levels in the blood and heart disease. Earlier studies suggested that the relationship has led to dietary guidelines for almost a decade that recommend consuming no more than 300 milligrams of cholesterol per day; The egg contains about 186 milligrams.
Recent studies question this relationship and reveal that saturated fat contributes to the unhealthy levels of cholesterol in the blood that can cause heart problems.
The latest U.S. government nutrition guidelines, 2015, eliminated a strict daily cholesterol limit. Although it is still advisable to eat as much cholesterol as possible, recommendations say that eggs can still be part of healthy eating as a good source of protein, along with lean meat, chicken, beans and nuts. Nutrition experts say a new study is unlikely to change that advice.
Dr. Frank Hu, of Harvard University, noted that most of the previous studies have shown that eating several eggs a week is not related to the risks of heart disease in generally healthy people.
"I think this study does not change the general guidelines for healthy eating," which emphasizes fruit, vegetables, whole grains, nuts and beans, and restricts processed meat and sugar, Hu said.
Eggs, a basic breakfast for many, can be included, but other options, such as toasted beef with olive butter, fresh fruit and yogurt, should be considered, "said Hu.
Dr. Rosalind Coleman, Nutrition and Pediatric Professor at North Carolina University, offered wider tips.
"The public's main message is not to choose the type of food as" bad "or" good ", but to evaluate its total diet in terms of diversity and quantity.
"I'm sorry if it looks boring," he added, but for most people, the most important nutrition advice "should be to maintain healthy weight, exercise and sleepiness."