Eggs are good sources of protein (both whites and yolks), unsaturated fats, and vital elements including vitamin B6, B12, and vitamin D, explains internal medicine specialist Kurt Hong, MD, of Keck Medicine of USC. Together, these nutrients support general health and welfare. Being a complete protein source with all nine essential amino acids in the proper ratios, eggs' protein composition is very remarkable. Moreover, egg nutrients have very great bioavailability, which means our bodies can quickly absorb and use them. Eggs are therefore a great choice for everyone from young children to senior folks, sportsmen to working professionals.