They provide excellent-quality protein

Eggs are widely considered to be a valuable source of quality protein. Why is this important? Proteins are essential for the repair and strength of muscle and tissue. In fact, a single egg contains roughly 6.3 grams of protein.

The emphasized advantage of the protein in eggs is that they have all nine essential amino acids in adequate amounts to support muscle growth, recovery, and maintenance.

So even though there ARE some other foods that contain protein besides eggs, the high quality and bio-availability of protein in eggs are unmatched.