Hi, Welcome to icliniq.com. McArdle's disease is caused by deficiency of enzyme glycogen phosphorylase, which causes inability to breakdown glycogen. It is a genetic disease; autosomal recessive, which means when both your parents have abnormal gene it is inherited. Just you have to vary dietary habits such as high protein diet; glucose in case of energy need like candy or Glucon-D. It does not cause any symptoms.
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