Why do we have white half circles at the top of our nails?

A peson told me that it is protein.Why do we have white half circles at the top of our nails?
The lunula is the half-moon shaped pale area at the bottom of nails. If you have large cuticles and small nails, the lunula may not be readily visible. It is usually best seen on the thumbnail. Some apparently healthy children and teens do not have a lunula, but most people do.





The actual size of the lunula does not correlate with disease or health. The lunula may disappear in the presence of poor nutrition with protein deficiency and with chronic diseases, such as liver cirrhosis, heart failure, diabetes, tuberculosis, rheumatoid arthritis, and multiple sclerosis.Why do we have white half circles at the top of our nails?
proteins make your nails grow faster and stronger. but its because the top of your nails is not attached top your skin. in other words there is no skin directly underneath the top of your nail. thats why it has a lighter shade of beige
its just that your nail has grown out past the skin of your finger so naturally it will be exposed to the air and get dirt particles in it making it that different color
i was told it was calcium.... like if you need more, the white part is more visable and maybe larger... also little white marks on your nails.. hope this helps