Thanks to the grasspea, an aquatint print by Goya showing the use of grasspea as a famine food but also highlighting its effects (crippled woman lying on the floor)
|Classification and external resources|
Lathyrism or neurolathyrism is a neurological disease of humans and domestic animals, caused by eating certain legumes of the genus Lathyrus. This problem is mainly associated with Lathyrus sativus (also known as Grass pea, Kesari Dhal, Khesari Dhal or Almorta) and to a lesser degree with Lathyrus cicera, Lathyrus ochrus and Lathyrus clymenum containing the toxin ODAP. The lathyrism resulting from the ingestion of Lathyrus odoratus seeds (sweet peas) is often referred to as odoratism or osteolathyrism, which is caused by a different toxin (beta-aminopropionitrile) that affects the linking of collagen, a protein of connective tissues.
The consumption of large quantities of Lathyrus grain containing high concentrations of the glutamate analogue neurotoxin β-oxalyl-L-α,β-diaminopropionic acid (ODAP, also known as β-N-oxalyl-amino-L-alanine, or BOAA) causes paralysis, characterized by lack of strength in or inability to move the lower limbs, and may involve pyramidal tracts producing signs of upper motor neuron damage. The toxin may also cause aortic aneurysm. A unique symptom of lathyrism is the atrophy of gluteal muscles (buttocks). ODAP is a poison of mitochondria leading to excess cell death, especially in motor neurons.
The toxicological cause of the disease has been attributed to the neurotoxin ODAP which acts as a structural analogue of the neurotransmitter glutamate. Ingestion of legumes containing the toxin results mostly from ignorance of their toxicity and usually occurs where the despair of poverty and malnutrition leaves few other food options. Lathyrism can also be caused by food adulteration.
Food preparation is also an important factor. Toxic amino acids are readily soluble in water and can be leached. Bacterial (lactic acid) and fungal (tempeh) fermentation is useful to reduce ODAP content. Moist heat (boiling, steaming) denatures protease inhibitors which otherwise add to the toxic effect of raw grasspea through depletion of protective sulfur amino acids.
The underlying cause for excessive consumption of grasspea is a lack of alternative food sources. This is a consequence of poverty and political conflict. The prevention of lathyrism is therefore a socio-economic challenge.
The first mentioned intoxication goes back to ancient India and also Hippocrates mentions a neurological disorder 46 B.C. in Greece caused by Lathyrus seed. Lathyrism was occurring on a regular basis.
During the Spanish War of Independence against Napoleon, grasspea served as a famine food. This was the subject of one of Francisco de Goya's famous aquatint prints titled Gracias a la Almorta ("Thanks to the Grasspea"), depicting poor people surviving on a porridge made from grasspea flour, one of them lying on the floor, already crippled by it.
During WWII, on the order of Colonel I. Murgescu, commandant of the Vapniarka camp in Transnistria, the detainees - most of them Jews - were fed nearly exclusively with fodder pea; consequently they got ill of "lathyrisms".
In the film Ashes [English title] by Andrzej Wajda based on the novel Popioly [Polish title] translated as Lost army [English title] by Stefan Żeromski spanning the period 1798–1812, a horse is poisoned by grain from a Spanish village. The footage of the horse losing control of its hind legs suggests that it was fed with Almortas.
In Spain, a seed mixture known as comuña consisting of Lathyrus sativus, L. cicera, Vicia sativa and V. ervilia provides a potent mixture of toxic amino acids to poison monogastric (single stomached) animals. Particularly the toxin beta-cyanoalanine from seeds of V. sativa enhances the toxicity of such a mixture through its inhibition of sulfur amino acid metabolism [conversion of methionine to cysteine leading to excretion of cystathionine in urine] and hence depletion of protective reduced thiols. Its use for sheep does not pose any lathyrism problems if doses do not exceed 50 percent of the ration.
Ronald Hamilton suggested in his paper The Silent Fire: ODAP and the death of Christopher McCandless that Christopher McCandless may have died from starvation after being unable to hunt or gather food due to lathyrism induced paralysis of his legs caused by eating the seeds of Hedysarum alpinum. In 2014, a preliminary lab analysis indicated that the seeds did contain ODAP. However, a more detailed mass spectrometric analysis conclusively ruled out ODAP and lathyrism.  Further studies showed that McCandless' death can be attributed to amino acid L-Canavanine, proven to exist in Hedysarum alpinum. 
A related disease has been identified and named osteolathyrism, because it affects the bones and connecting tissues, instead of the nervous system. It is a skeletal disorder, caused by the toxin beta-aminopropionitrile (BAPN), and characterized by hernias, aortic dissection, exostoses, and kyphoscoliosis and other skeletal deformities, apparently as the result of defective aging of collagen tissue. The cause of this disease is attributed to beta-aminopropionitrile, which inhibits the copper-containing enzyme lysyl oxidase, responsible for cross-linking procollagen and proelastin. BAPN is also a metabolic product of a compound present in sprouts of grasspea, pea and lentils. A disorder that is clinically similar is konzo.
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- The Holocaust in Romania Under the Antonescu Government by Marcu Rozen - http://isurvived.org/
- "AZCOYTIA, Carlos (2006): "Historia de la Almorta or el veneno que llegó con el hambre tras la Guerra Civil Española". ''HistoriaCocina''". Historiacocina.com. Retrieved 2013-09-23.
- The etymological origin of this name is from "común" (common) in its meaning of mixture, referring to the mix of seeds obtained when cleaning the grain and which contaminate the main grain, generally wheat.
- J.E. Hernández Bermejo; J. León (1994). Neglected crops 1492 from a different perspective. Rome: Food and Agriculture Organization of the United Nations. ISBN 92-5-103217-3.
- Ronald Hamilton (September 12, 2013). "ODAP and the death of Christopher McCandless".
- Jon Krakauer et. al. (March, 2015). "Presence of L-Canavanine in Hedysarum alpinum Seeds and Its Potential Role in the Death of Chris McCandless". Check date values in:
- COHN, D.F. (1995) "Are other systems apart from the nervous system involved in human lathyrism?" in Lathyrus sativus and Human Lathyrism: Progress and Prospects. Ed. Yusuf H, Lambein F. University of Dhaka. Dhaka pp. 101-2.