The study, published in the American Journal of Clinical Nutrition, is an extension of previous research that found similar results over a three month period.
In the initial trial, participants aimed to maintain their weight while embarking on a high-egg (12 eggs per week) or low-egg (less than two eggs per week) diet, with no difference in cardiovascular risk markers identified at the end of three months.
The same participants then embarked on a weight loss diet for an additional three months, while continuing their high or low egg consumption.
For a further six months – up to 12 months in total – the participants were followed by researchers and continued their high or low egg intake.
Both groups showed no adverse changes in cardiovascular risk markers and achieved equivalent weight loss – regardless of their level of egg consumption – at all stages, according to the researchers.
Study leader Dr Nick Fuller, of the University of Sydney, said: “Despite differing advice around safe levels of egg consumption for people with pre-diabetes and type 2 diabetes, our research indicates people do not need to hold back from eating eggs if this is part of a healthy diet.
“A healthy diet as prescribed in this study emphasised replacing saturated fats – such as butter – with monounsaturated and polyunsaturated fats – such as avocado and olive oil.”
The extended study tracked a range of cardiovascular risk factors including cholesterol, blood sugar and blood pressure, with no significant difference in results between the high egg and low egg groups.
Dr Fuller said: “While eggs themselves are high in dietary cholesterol – and people with type 2 diabetes tend to have higher levels of the ‘bad’ low density lipoprotein cholesterol – this study supports existing research that shows consumption of eggs has little effect on the levels of cholesterol in the blood of the people eating them.”
He said the findings of the study were important due to the potential health benefits of eggs for people with pre-diabetes and type 2 diabetes, as well as the general population.
Dr Fuller said: “Eggs are a source of protein and micronutrients that could support a range of health and dietary factors including helping to regulate the intake of fat and carbohydrate, eye and heart health, healthy blood vessels and healthy pregnancies.”
He said the different egg diets also appeared to have no impact on weight.
Dr Fuller added: “Interestingly, people on both the high egg and low egg diets lost an equivalent amount of weight – and continued to lose weight after the three month intended weight loss phase had ended.”
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