Dr. Richard Jacoby, Director of the Scottsdale Neuropathy Institute, offers up some advice on nails. A specialist who knows what he's looking for will give some attention to finger and toe nails because they can be a reflection of what's going on in the body.
Clear nails are healthy nails. A nail that is yellow or brown or has some other hint of color, is not healthy and may be an indicator of diabetes. Dr. Jacoby hastens to add that this discoloration can happen after people paint their toenails, so if you paint your nails, keep that in mind.
"The coloration is probably the first thing that makes a difference visually and then the texture and then there’s a whole series of different pathologies that occur that change the shape of the nail, number one of which is fungus, and that’s a thickening of the nail, but a lot of thick nails are due to trauma, irritation on the nail, either a micro trauma, irritation from issues, or a macro trauma where there’s actual physical abrasion of the nail."