Good Eggs: For Nutrition, They're Hard to Beat
The egg is no longer a nutritional no-no
By Kathleen Zelman, MPH, RD, LD
What would we do without the egg? It's a dietary mainstay, not only for breakfast but to feed finicky kids, stand in for a quick lunch or supper, blend raw into holiday nogs, and as an ingredient in all kinds of sweet and savory dishes.
But for a few decades there, eggs had a rather unwholesome reputation. Thanks to its high cholesterol content, the egg was deemed villainous. Years went by while many of us shunned eggs, ate only the whites, or ventured into the world of egg substitutes.
Then, in 2000, the American Heart Association (AHA) revised its dietary guidelines and gave healthy adults the green light to enjoy eggs once again. The AHA's guidelines now allow an egg a day for healthy adults while still advising a total daily cholesterol limit of 300 mg.
The confusion over eggs stems from their cholesterol content. One large egg contains 213 mg of cholesterol, accounting for two-thirds of the recommended daily limit.
When scientists learned that high blood cholesterol was associated with heart disease, foods high in cholesterol logically became suspect. But after 25 years of study, it has become evident that cholesterol in food is not the culprit -- saturated fat has a much bigger effect on blood cholesterol. Full-fat dairy products and fatty meats are examples of foods that are loaded with saturated fat and which trigger the body to produce cholesterol.
Let Us Eat Eggs
With science on our side, we can once again enjoy the wonderfully nutritious egg. Along with milk, eggs contain the highest biological value (or gold standard) for protein. One egg has only 75 calories but 7 grams of high-quality protein, 5 grams of fat, and 1.6 grams of saturated fat, along with iron, vitamins, minerals, and carotenoids.
The egg is a powerhouse of disease-fighting nutrients like lutein and zeaxanthin. These carotenoids may reduce the risk of age-related macular degeneration, the leading cause of blindness in older adults. And brain development and memory may be enhanced by the choline content of eggs.
But the full health benefits of eggs can only be realized if you store them properly -- in the refrigerator -- and cook them thoroughly to kill any potential bacteria. As a child, I loved my father's eggnogs, made with fresh, raw eggs blended with milk, vanilla and ice. These delicious treats are no longer considered a good option -- unless pasteurized eggs are used in place of the raw eggs.
Creating Designer Eggs
Not all eggs are created equally. Manufacturers and chicken farmers have taken steps to enhance eggs' nutritional properties, spawning an entire industry devoted to improving the dietary quality of the egg.
"Designer" eggs may come from chickens that are allowed to roam freely (free range) or whose feed is supplemented with omega-3 fatty acids. Hens given feed that is free of animal products produce vegetarian eggs, while those given all-organic feed produce organic eggs.
Some chicken feed is enriched with canola oil, bran, kelp, flaxseed, marine algae, fish oil, or vitamin E to increase the eggs' healthy omega-3 fatty acid content. Certain types of feed are designed to reduce the saturated and total fat content of the egg yolk. Marigold extract has been used to increase the lutein content of eggs.
Beyond nutrition, other specialty eggs use a pasteurization process that heats the egg just enough to kill bacteria without affecting the texture of the raw product.
Keep in mind that, with designer eggs, you generally get designer prices. The good news is that if you prefer organic, vegetarian, or nutrient-enriched eggs, they are widely available on the market. When choosing eggs, check the label and contrast the nutritional content of designer eggs to the profile of the generic egg, which is 213 mg cholesterol, 1.6 g saturated fat, 1 IU vitamin E, and 35-40 mg omega-3s.
A Satisfying Source of Protein
Another good reason to eat eggs is that they help keep you feeling full. An egg, a few slices of whole-grain toast, and half a grapefruit is a low-calorie breakfast that will keep you satisfied until lunch. As you face the challenge of losing weight, it's important to eat foods that are naturally nutrient-rich and stave off hunger between meals. The egg is an "eggcellent" example.
Eggs are easy to eat, well-tolerated by young and old, adaptable to any meal, and inexpensive. Whether you prefer designer or generic eggs, manage your egg intake over the course of a week. On days when you enjoy eggs for breakfast, it's wise to limit foods high in cholesterol and saturated fat for the rest of the day.
Of course, it's a good idea to know your blood cholesterol level and talk with your physician about the cholesterol and saturated fat content of your eating plan. People with high cholesterol levels should follow their doctor's advice about eating eggs.
Originally published April 1, 2004
©2005 WebMD Inc. All rights reserved.
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