"So much data have already been published on this topic, which generally show that low-to-moderate egg consumption (no more than one egg per day) is not associated with increased risk of heart attack or stroke", Frank Hu, a professor of nutrition and epidemiology at the Harvard T.H. Chan School of Public Health, said in an email.
"We want to remind people there is cholesterol in eggs, specifically yolks, and this has a harmful effect", said Allen, who cooked scrambled eggs for her children that morning.
"I'm sorry if it seems like a boring recommendation", she added, but for most people, the most important diet advice "should be to maintain a healthy weight, to exercise, and to get an adequate amount of sleep".
The association of egg consumption and increased heart disease risk was significant even after adjusting for confounding factors like age, sex, race, ethnicity, education level, personal habits like smoking or alcohol intake, physical activity levels, body mass indices (BMIs), blood pressures, lipid levels and any existing medical conditions.
The researchers evaluated 29,615 participants with an average age of 51, who took part in six separate studies in the U.S. The median follow-up time across the studies was 17.5 years, with the longest time being 31 years.
People who eat three or four eggs a day - or any equivalent of 300 mg of dietary cholesterol - have a higher risk of both heart disease and early death compared to those who eat fewer eggs, according to new research. Of course, cheeseburgers have many other dietary problems, including saturated fat and sodium.
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The new findings contradict the latest dietary guidelines for Americans, released in 2015; in them, the U.S. Department of Health and Human Services and the U.S. Department of Agriculture (USDA) said that Americans no longer had to worry about keeping their cholesterol intake within a certain limit.
US dietary protocols that limits on cholesterol have assisted eggs make a return. "Our findings contribute scientific evidence to the dietary guidelines with regard to egg consumption for the healthy Chinese adult".
Other animal products such as red meat, processed meat and high-fat dairy products (butter or whipped cream) also have high cholesterol content, said lead author Wenze Zhong, a postdoctoral fellow in preventive medicine at Northwestern.
You might be forgiven for thinking of eggs as beyond reproach. The average egg contains 200 milligrams - more cholesterol than is in most fast-food double cheeseburgers. "Eat them in moderation".
Diet data were collected using food frequency questionnaires or by taking a diet history.
But the Northwestern researchers said their study suggests those guidelines may have to be looked at yet again. On common, members had been adopted for about 17 years. "Still, people may have changed their diet, and we can't account for that".
"We have one snapshot of what their eating pattern looked like", Allen said.