What was the specific actual cause of pellagra in the US?

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BlackTom AI · Accepted Answer

In evaluating the question about the specific actual cause of pellagra in the US, a careful look at each option is needed.
Option 1: 'Outbreak of lice in warm areas'—Pellagra is not caused by parasitic infestations or lice outbreaks. This option confuses a potential public health nuisance with the nutritional deficiency syndrome pellagra, which stems from diet and metabolism rather than ectoparasites.
Option 2: 'Mosquito bites'—Pellagra has no etiological link to vector-borne infections. Mosquito bites transmit other pathogens, but they do not cause niacin deficiency or pellagra. This choice misattributes the disease to an infectious vector rather than a nutritional deficiency.
Option 3: 'Low intake of the vitamin niacin (nicotinic acid)'—This aligns with the established cause of pellagra, historically observed in populations with diets heavily reliant on corn-based foods lacking bioavailable niacin or tryptophan, and in conditions with poor overall nutrition. The deficiency leads to the characteristic dermatitis, diarrhea, and dementia associated with pellagra.
Option 4: 'Intake of fatty meat'—High or specific fatty meat consumption is not recognized as the cause of pellagra. In fact, some traditional approaches to prevent pellagra involved diversifying diet beyond starches and restricted items; fatty meat intake per se is not a causal factor for pellagra.
Overall, the reasoning centers on understanding pellagra as a nutritional deficiency related to niacin availability, rather than infectious or dietary choices unrelated to niacin content. The misattributions in the first two options reflect common misconceptions about disease causation, while the fourth option incorrectly links the condition to a general dietary component rather than the critical niacin deficiency.

11:709:255:01 NUTRITION AND HEALTH Lecture Quiz 1 - DRI Quiz S2025

What was the specific actual cause of pellagra in the US?

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