Why did people from southern Asia commonly suffer from beriberi sickness in late 1800s?

eating toxic sea algae
inbreeding
drinking dirty water
eating mostly white rice
Beriberi is a sickness caused by extreme deficiency of vitamin B1, thiamine. White rice is generally a poor source of vitamins, and completely lacks thiamine. The sickness became common in Asia in 1800s with the increased processing of rice.
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eating toxic sea algae
inbreeding
drinking dirty water
eating mostly white rice
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