Deficiency of ______ causes a disease known as beri-beri.
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Solution
Beri-beri is a nutritional disorder caused by a deficiency of thiamine (vitamin B1).
It is caused by poor diet and excess drinking of alcohol.
There are two main types: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system while dry beriberi damages the nerves and can lead to reduced muscle strength.