Pellagra
2007 Schools Wikipedia Selection. Related subjects: Health and medicine
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|---|---|---|
| Niacin | ||
| ICD- 10 | E 52. | |
| ICD- 9 | 265.2 | |
| DiseasesDB | 9730 | |
| MedlinePlus | 000342 | |
| eMedicine | ped/1755 | |
| MeSH | C18.654.521.500.133.699.529 | |
Pellagra is a vitamin deficiency disease caused by dietary lack of niacin (vitamin B3) and protein, especially proteins containing the essential amino acid tryptophan. Because tryptophan can be converted into niacin, foods with tryptophan but without niacin, such as milk, prevent pellagra. However, if dietary tryptophan is diverted into protein production, niacin deficiency may still result.
Some sources also claim a relationship between lysine and pellagra, but this position does not have nearly as much support.
Symptoms
The symptoms of pellagra include:
- high sensitivity to sunlight
- aggression
- dermatitis
- red skin lesions
- insomnia
- weakness
- mental confusion
- diarrhea
- dementia (eventually)
The main results of pellagra can easily be remembered as "the four D's": diarrhea, dermatitis, dementia, and death.
Epidemiology
Pellagra can be common in persons who obtain most of their food energy from corn, since untreated corn is a poor source of niacin (vitamin B3). Corn is also a poor source of tryptophan. This disease can be common among people who live in rural South America where corn is a staple. The symptoms usually appear during spring, increase in the summer due to greater sun exposure, and return the following spring. It is also one of several diseases of malnutrition common in Africa, and was endemic in northern Italy, Spain, and southeastern Europe. Alkali treatment of the corn corrects the niacin deficiency, and was a common practice in native American cultures that grew corn. The amino acid deficiency must be balanced by consumption of other sources of protein. It was also common amongst prisoners of Soviet labor camps, the infamous Gulag.
Prognosis
Untreated, the disease can kill within four or five years.
With treatment pellagra can be cured.
History
The traditional food preparation method of corn, nixtamalization, by native New World cultivators, who had domesticated corn, required treatment of the grain with lime, an alkali. It has now been shown that the lime treatment makes niacin nutritionally available and reduces the chance of developing pellagra. When corn cultivation was adopted worldwide, this preparation method was not accepted because the benefit was not understood. The original cultivators, often heavily dependent on corn, did not suffer from pellagra. Pellagra became common only when corn became a staple that was eaten without the traditional treatment.
Pellagra was first described in Spain in 1735. It was an endemic disease in northern Italy, where it was named "pelle agra" (pelle, skin; agra, sour) by Francesco Frapoli of Milan. Because pellagra outbreaks occurred in regions where maize was a dominant food crop, the belief for centuries was that the maize either carried a toxic substance or was a carrier of disease. It was not until later that the lack of pellagra outbreaks in Mesoamerica, where maize is a major food crop (and is processed), that the idea was considered that the causes of pellagra may be due to factors other than toxins.
There has been speculation that the legend of vampires may have been furthered in the 1700s during pellagra outbreaks in Europe.
In the early 1900s, pellagra reached epidemic proportions in the American South. There were 1,306 reported pellagra deaths in South Carolina during the first ten months of 1915; 100,000 Southerners were infected in 1916. At this time, the scientific community held that pellagra was probably caused by a germ or some unknown toxin in corn. The Spartanburg Pellagra Hospital in Spartanburg, South Carolina was the nation's first facility dedicated to discovering the cause of pellagra. It was established in 1914 with a special congressional appropriation to the U.S. Public Health Service (PHS) and set up primarily for research. In 1915 Joseph Goldberger, assigned to study pellagra by the Surgeon General of the United States, showed that pellagra was linked to diet by inducing the disease in prisoners, using the Spartanburg Pellagra Hospital as his clinic. By 1926, Goldberger established that a balanced diet or a small amount of baker's yeast prevented pellagra. Skepticism still persisted in the medical community until 1937 when Conrad Elvehjem showed that the vitamin niacin cured pellagra (manifested as black tongue) in dogs. Later studies by Tom Spies, Marion Blankenhorn and Clark Cooper established that niacin also cured pellagra in humans, for which Time Magazine dubbed them its 1938 Men of the Year in comprehensive science.