Final answer:
Dry, brittle hair and nails are indications of malnutrition, reflecting inadequate intake of proteins and essential nutrients necessary for maintaining healthy keratin structures.
Step-by-step explanation:
The nurse should identify dry, brittle hair and nails as an indication of malnutrition. This symptom often appears in individuals who have inadequate protein intake, essential fatty acids, vitamins, and minerals which are critical for maintaining healthy hair and nail structures. Hair and nails are made of keratin, a protein that requires proper nutrition to be produced effectively. A loss of keratin due to malnutrition can lead to them becoming dry and brittle. Other symptoms of malnutrition include weight loss, muscle weakness, and poor immune function. Addressing malnutrition involves increasing the intake of a well-balanced diet rich in proteins, calories, and other essential nutrients to support the patient in regaining their health.