White Stripes (Muehrcke’s Lines)
White horizontal lines that don’t indent the nail may suggest low blood protein, liver disease, or kidney issues—especially if they appear on multiple nails and fade when pressed.

The Role of Nutrition
Most nail changes are linked to poor diet rather than serious illness. A lack of protein, biotin, iron, or zinc can lead to weak, brittle nails. Improving your nutrition often helps restore nail health.

Bottom Line
While some nail changes are normal, persistent or sudden differences could reflect underlying health problems. Pay attention—your nails may be trying to tell you something important.