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Dark urine and decreased urinary output are two warning signs of  anorexia nervosa.

Women suffering from anorexia nervosa may experience sever consequences because the lower urinary tract is estrogen sensitive, on examining anorexic women  the majority were having significant irritative urinary symptoms of which frequency, urgency and nocturia were the most common.

Anorexia nervosa can alter the kidney in diverse ways, including increased rates of acute kidney injury and chronic kidney disease, electrolyte abnormalities, and nephrolithiasis. Anorexia nervosa may be warning sign of several medical complications, including dysfunction of the renal system.

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