Definition

1. Noun:
   • A nutritional deficiency disease: Pellagra is a disease caused by a severe lack of niacin (vitamin B3) or its precursor, the amino acid tryptophan, in the diet. It is characterized by a classic set of symptoms affecting the skin, digestive system, and nervous system.

Usage

• Pellagra is a medical condition resulting from malnutrition or an impaired ability to absorb or process niacin.
• It is historically associated with diets heavily reliant on untreated corn (maize).
• The term is used in medical, historical, and public health contexts.

Examples

• Noun:
  • Pellagra was once endemic in populations whose staple food was corn.
  • The doctor diagnosed the patient with pellagra after observing the dermatitis, diarrhea, and dementia.
  • Public health initiatives to fortify flour with niacin have virtually eliminated pellagra in many countries.

Advanced Usage

• "Pellagra-preventing factor": An early historical term for niacin (vitamin B3), reflecting its role in preventing the disease.
  • The identification of the "pellagra-preventing factor" was a major breakthrough in nutritional science.

Variants and Related Words

• Pellagrous (adj): Relating to or affected by pellagra.
  • The physician documented the pellagrous symptoms in his notes.

Synonyms

• Niacin deficiency: A more clinical term describing the cause.
• Vitamin B3 deficiency: A direct synonym specifying the deficient nutrient.

Different Meanings

• Pellagra has a single, specific medical meaning as defined above. It is not used in other general contexts.

Notes

• The classic symptoms of pellagra are often remembered by the "three Ds": Dermatitis, Diarrhea, and Dementia. If untreated, it can lead to a fourth "D": Death.
• While primarily caused by dietary deficiency, pellagra can also be secondary to other conditions like alcoholism or certain diseases (e.g., carcinoid syndrome) that interfere with tryptophan metabolism.

Noun

1. a disease caused by deficiency of niacin or tryptophan (or by a defect in the metabolic conversion of tryptophan to niacin); characterized by gastrointestinal disturbances and erythema and nervous or mental disorders; may be caused by malnutrition or alcoholism or other nutritional impairments