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What is nonalcoholic fatty liver disease and what are its risk factors?

Definition of NAFLD 
This is a condition where patients having hepatic steatosis with or without inflammation and fibrosis, without any secondary causes of hepatic steatosis.

Following are the criteria for diagnosing nonalcoholic fatty liver disease
Imaging or biopsy should demonstrate  hepatic steatosis. 
Significant alcohol consumption  should be excluded.
Other causes of hepatic steatosis  should be  excluded.

What are the stages of NAFLD?
It include progression from steatosis, steatohepatitis to cirrhosis of liver
Steatosis ( Fatty liver )– NAFLD
Steatohepatitis – NASH

What are the disorders associated  with  NAFLD
Systemic Hypertension
Insulin resistance or overt diabetes
Hypopituitarism and hypogonadism
A family history of steatohepatitis or cryptogenic cirrhosis is  also implicated as a risk factor

Prevalence  of NAFLD
It is seen in 10-24% of general population.
2.6% of pediatric population have NAFLD.
It is the most common cause of cryptogenic cirrhosis
2/3rd of the obese patients have NASH.
90% of  morbidly obese patients have NASH.