What is a common sign that may indicate a nutritional deficiency in nails?

Soft and brittle nails are a common sign that may indicate a nutritional deficiency. This condition often arises when the body lacks essential nutrients necessary for healthy nail growth and maintenance, such as proteins, biotin, zinc, iron, and certain vitamins. Nutritional deficiencies can hinder the production of keratin, the main structural protein in nails, leading to weak, soft, and easily broken nails.

In contrast, hard and shiny nails are typically a sign of good health and proper nutrition, as they reflect strong nail structure and hydration. Long and smooth nails generally indicate healthy growth, while thick and healthy nails signify adequate nutrition and a lack of deficiencies. Thus, soft and brittle nails can serve as a crucial indicator prompting the need for dietary evaluation and adjustment.