Alcohol flush reaction (also known as Asian flush syndrome, Asian flush, Asian glow, among others) is a condition in which an individual's face or body experiences flushes or blotches as a result of an accumulation of acetaldehyde, a metabolic byproduct of the catabolic metabolism of alcohol.
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It is commonly thought that the flush reaction is caused by an inability to metabolize alcohol. To the contrary, around 80% of Asian people (less common in Thailand and India) have a variant of the gene coding for the enzyme alcohol dehydrogenase called ADH1B, and almost all Chinese and Korean people have a variant of the gene called ADH1C.
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Alcohol flush reaction is best known as a condition that is experienced by people of Asian descent. According to the analysis by HapMap project, the rs671 allele of the ALDH2 gene responsible for the flush reaction is rare among Europeans and Africans, and it is very rare among Mexican-Americans. 30% to 50% of people of Chinese and Japanese ancestry have at least one ALDH*2 allele.
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For those that are interested: http://en.wikipedia.org/wiki/Alcohol_flush_reaction
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