Which of the following is NOT one of the symptoms of pellagra?

Pellagra is a condition caused by a deficiency of niacin (vitamin B3) and is characterized by the classic triad of symptoms: dermatitis, diarrhea, and dementia. These symptoms reflect the impact of inadequate niacin levels on various bodily systems.

Dermatitis associated with pellagra often appears as a scaly skin rash, particularly in sun-exposed areas. Diarrhea may manifest as gastrointestinal distress. Dementia refers to cognitive decline that can occur due to the deficiency affecting the nervous system.

In contrast, weight gain is not a symptom of pellagra. In fact, individuals affected by pellagra often experience weight loss due to a decreased appetite and malabsorption associated with gastrointestinal symptoms. Thus, identifying weight gain as a symptom is incorrect, as it does not align with the consequences of niacin deficiency and the other well-documented effects of pellagra.