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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flagPakistan
4%
2%
2%
90%
41
flagGermany
3%
6%
27%
60%
66
flagAustralia
4%
9%
22%
59%
22
flagGreece
0%
25%
16%
58%
12
flagCanada
7%
7%
28%
57%
14
flagItaly
12%
0%
37%
50%
16
flagIndia
21%
4%
25%
48%
88
flagPoland
7%
15%
38%
37%
10849
flagthe United States
9%
8%
46%
36%
100
flagthe United Kingdom
8%
8%
45%
34%
46
flagIndonesia
23%
38%
7%
30%
13
flagthe Philippines
27%
9%
36%
27%
11
flagSwitzerland
15%
10%
50%
25%
20