According to WebMD, eggs have one of the highest biological values for protein along with milk. As Self magazine also notes, eggs are also good sources of phosphorous, selenium and vitamin B12.
The downside to eggs is that they are very high in cholesterol, says Self. WebMD shares, however, that recent scientific studies have shown that the cholesterol in eggs and other foods is not as bad as most people believe. It notes that over a 25-year-period of study, scientists have discovered saturated fats are actually much more harmful as a trigger for high cholesterol than eggs. In moderation, eggs are an excellent source of nutrition and are extremely useful in fighting certain diseases.
The choline content in eggs is helpful in promoting good memory and brain development and carotenoids may help to reduce macular degeneration, which is the foremost cause of blindness in older adults. There are also many farmers in recent years who have made a goal of improving the nutritional value of eggs. WebMD refers to these types of efforts as "creating designer eggs." They key to this strategy is how farmers feed their chickens. Chickens that are allowed to roam free often have their feed supplemented with extremely nutritional omega-3 fatty acids.