About this episode
Episode 172: NAFLD and ObesityFuture Dr. Nguyen explains the pathophysiology of non-alcoholic fatty liver disease and how it relates to obesity. Dr. Arreaza gives information about screening and diagnosis of NAFLD. Written by Ryan Nguyen, MS4, Ross University School of Medicine. Comments by Hector Arreaza, MD.You are listening to Rio Bravo qWeek Podcast, your weekly dose of knowledge brought to you by the Rio Bravo Family Medicine Residency Program from Bakersfield, California, a UCLA-affiliated program sponsored by Clinica Sierra Vista, Let Us Be Your Healthcare Home. This podcast was created for educational purposes only. Visit your primary care provider for additional medical advice.Introduction/PathophysiologyNonalcoholic fatty liver disease (NAFLD) refers to the buildup of excess fat in liver cells, occurring without the influence of alcohol or drugs. Nonalcoholic steatohepatitis (NASH) represents a more severe form of NAFLD, characterized by inflammation and liver cell injury due to fat accumulation. If left untreated, NASH can progress to liver fibrosis or cirrhosis. Typically, NAFLD/NASH is diagnosed after other liver conditions are ruled out, making it a diagnosis of exclusion.NAFLD -> NASH -> Cirrhosis -> Liver failure. Another term for NAFLD is metabolic dysfunction-associated steatotic liver disease. Fatty liver disease is identified when more than 5% of liver weight consists of fat, whereas, NASH is diagnosed when this fat accumulation is accompanied by inflammation and liver cell injury, sometimes leading to fibrosis. Understanding these distinctions is crucial in recognizing and managing the spectrum of liver conditions associated with obesity and metabolic syndrome.BMI serves as a tool to gauge body fat levels: individuals are categorized as normal weight if their BMI falls between 18.5 and 24.9, overweight if it ranges from 25 to 29.9. Class I obesity is diagnosed with a BMI of 30 to 34.9, class II obesity between 35 and 39.9, and class III obesity when BMI exceeds 40.Obesity puts you at risk of NAFLD, but you can also see NAFLD in non-obese patients, but the prevalence is very low, about 5%. What did you learn about the demographics of NAFLD?NAFLD is most widespread in regions like South Asia, the Middle East, Mexico, Central and South America, with prevalence rates exceeding 30%. In the United States, prevalence varies with approximately 23-27%, notably higher among Asians at 30%, followed by Hispanic individuals at 21%, White individuals at 12.5%, and Black individuals at 11.6%. Across all racial groups, obesity plays a significant role, affecting more than two-thirds of individuals diagnosed with NAFLD. Understanding these demographics underscores the global impact of obesity on NAFLD prevalence.Diagnosis: Screening/Labs/Imaging/ToolsThe American Association for the Stud
