Question

what is a deficiency diseases

Answer 1

for example a person has lack of any protein or mineral
the disease caused by lack of that protein or mineral is called deficiency disease
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Answer 2

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HERE IS THE ANSWER:-)
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The diseases which are caused due to the deficiency or lack of needed vitamins or nutrients in the human body,are known as deficiency diseases.
For example,Rickets is caused due to deficiency of Vitamin D.