What deficiency is characterized by dermatitis, slow healing, and hair loss?

The symptoms of dermatitis, slow healing, and hair loss are most closely associated with essential fatty acid deficiency. Essential fatty acids, such as omega-3 and omega-6 fatty acids, are crucial for various bodily functions, including skin health and inflammatory responses. A deficiency can lead to dermatitis, which presents as dry, flaky skin, and can also impair wound healing due to a reduced inflammatory response and compromised skin integrity. Additionally, hair loss occurs due to the disruption of the hair follicle cycle and associated skin health.

In terms of the other deficiencies, while vitamin A deficiency can lead to issues like skin dryness and hair follicle problems, it is not typically characterized by dermatitis in the same manner as essential fatty acid deficiency. Protein deficiency may lead to hair loss and skin issues, but it is often more associated with muscle wasting and overall malnutrition rather than specific dermatitis. Zinc deficiency is known for causing dermatitis as well, particularly around mucous membranes and skin lesions, but does not typically present as a primary symptom in the same way as essential fatty acid deficiency in the context of slow healing and widespread dermatitis. Thus, the combination of all these symptoms strongly points to essential fatty acid deficiency as the most accurate answer.