noun
a disease caused by a deficiency of thiamine (vitamin B1) in the diet, characterized by neurological symptoms and heart failure
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Beriberi is a disease caused by a deficiency of thiamine in the diet.
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My grandma used to tell me to eat my vegetables so I wouldn't get beriberi.
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I heard that skipping meals can give you beriberi, so make sure you eat regularly.
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In a metaphorical sense, neglecting self-care can lead to a form of 'beriberi' in terms of mental health.