Eggs are lower in cholesterol than previously thought, according to new nutrition data from the United States Department of Agriculture's Agricultural Research Service (USDA-ARS).
They recently reviewed the nutrient composition of standard large eggs, and results show the average amount of cholesterol in one large egg is 185 mg, 14% lower than previously recorded. The analysis also revealed that large eggs now contain 41 IU of vitamin D, an increase of 64%.
"We collected a random sample of regular large shell eggs from 12 locations across the country to analyse the nutrient content of eggs," says Dr Jacob Exler, Nutritionist with the Agricultural Research Service's Nutrient Data Laboratory. "This testing procedure was last completed with eggs in 2002, and while most nutrients remained similar to those values, cholesterol decreased by 14% and vitamin D increased by 64% from 2002 values."
Tests on eggs
The collected eggs were sent to a laboratory at Virginia Tech University to be prepared for nutrient analysis at certified nutrient analysis laboratories.
The samples were randomly paired for the testing procedure, and the analysis laboratories tested samples to determine composition of a variety of nutrients including protein, fat, vitamins and minerals. Accuracy and precision were monitored using quality control samples.
According to Exler, this procedure is standard for the National Food and Nutrient Analysis Program (NFNAP), the programme responsible for analysing the nutrient composition of a wide variety of foods and making nutrition information publicly available. The new nutrient information will also be updated on nutrition labels to reflect these changes wherever eggs are sold, from egg cartons in supermarkets to school and restaurant menus.
Cracking egg myths
Over the years, Americans have unnecessarily shied away from eggs – despite their taste, value, convenience and nutrition – for fear of dietary cholesterol. However, more than 40 years of research have demonstrated that healthy adults can enjoy eggs without significantly impacting their risk of heart disease.
"My research focuses on ways to optimise diet quality, and I have long suspected that eliminating eggs from the diet generally has the opposite effect. In our own studies of egg intake, we have seen no harmful effects, even in people with high blood cholesterol," says Dr David Katz, Director of the Yale University Prevention Research Centre.
Enjoying an egg a day can fall within current cholesterol guidelines, particularly if individuals opt for low-cholesterol foods throughout the day. The 2010 Dietary Guidelines for Americans suggest that eating one whole egg per day does not result in increased blood cholesterol levels and recommend that individuals consume, on average, less than 300mg of cholesterol per day. A single large egg contains 185mg cholesterol.
Some researchers believe the natural decrease in the cholesterol level of eggs could be related to the improvements farmers have made to the hens' feed. Hens are fed a high-quality, nutritionally balanced diet of feed made up mostly of corn, soybean meal, vitamins and minerals.
Poultry nutrition specialists analyse the feed to ensure that the natural nutrients hens need to stay healthy are included in their diets. Nutrition researchers at Iowa State University are compiling a report to outline potential reasons for the natural decrease in cholesterol in eggs.
Eggs now contain 41 IU of vitamin D, which is an increase of 64% from 2002. Eggs are one of the few foods that are a naturally good source of vitamin D, meaning that one egg provides at least 10% of the Recommended Daily Allowance (RDA). Vitamin D plays an important role in calcium absorption, helping to form and maintain strong bones.
The amount of protein in one large egg – 6g of protein or 12% of the Recommended Daily Value – remains the same, and the protein in eggs is one of the highest quality proteins found in any food. Eggs are all-natural, and one egg has lots of vitamins and minerals all for 70 calories.
The nutrients in eggs can play a role in weight management, muscle strength, healthy pregnancy, brain function, eye health and more. Eggs are an affordable and delicious breakfast option. - (EurekAlert!, February 2011)