Nonalcoholic Fatty Liver

Menopause increases the risk of metabolic dysfunction-associated steatotic liver disease (MASLD), possibly owing to the abrupt lack of estrogen. Gonadotropin-releasing hormone (GnRH) treatment in endometriosis is regarded as a model of pharmaceutical menopause. Thus, the effect of goserelin acetate, a GnRH analog that results in transient menopause, on hepatic steatosis and fibrosis will be evaluated in this study.

This study aims to identify the effect of adding TENS to the Mediterranean diet on appetite and liver enzymes in Nonalcoholic fatty liver patients.

The goal of this study is to evaluate the role of transcription factor EB (TFEB) in adipose (fat) tissue macrophages (ATM) in regulating adipose tissue and systemic metabolic function in obesity. The investigators will assess the differences in ATM lipid metabolism in people with metabolically abnormal obesity and lean individuals. Both groups will have: * screening visit * imaging (body composition testing - dual-energy x-ray absorptiometry (DEXA) scans, magnetic resonance imaging \[MRI\] and magnetic resonance spectroscopy \[MRS\] scans) * Overnight visit with intravenous infusion (IV), muscle, and fat tissue biopsies Participants with obesity will complete meetings with study team members for a weight loss intervention to achieve a 10% body weight loss.

This 12-week controlled diet and weight intervention study seeks to define the molecular pathways that link excess body weight to the development of insulin resistance (IR). Blood, adipose and stool are sampled at three timepoints; baseline, peak weight (4 weeks) and post weight loss to monitor changes in cellular processes. Additionally, direct insulin sensitivity testing, and radiological measurement of visceral fat and intrahepatic fat content is measured at three timepoints to correlate clinical indices with cellular changes.

Nonalcoholic fatty liver disease (NAFLD) is now the most common liver disease worldwide and affects nearly 40% of obese youth and up to 10% of the general pediatric population. Some features of NAFLD are similar in children and adults, yet fibrosis and inflammation are more common in the portal zone and occur earlier in pediatric NAFLD patients than adults. This portends a rapid progression to end-stage liver disease in early adulthood. For the majority of children with NAFLD, mechanisms driving the origin and rapid progression of disease remain unknown. Thus, there is a critical, unmet need to study the specific underlying patterns of metabolic and molecular changes in the liver underlying the development and progression unique to children with NAFLD. This proposal will test the hypotheses that children with NAFLD have excess glucose and lipid produced by the liver, that those events are regulated by specific variations in the amount and location of RNAs and proteins in liver, and that the concentration of specific micro-RNAs in the blood can be used as a biomarker for NAFLD in pediatric patients.

Nonalcoholic fatty liver disease (NAFLD) is a progressive liver disease ranging from simple steatosis to cirrhosis of the liver. Nonalcoholic fatty liver (NAFL) without substantial hepatocellular injury is thought to be relatively benign whereas nonalcoholic steatohepatitis (NASH) is characterized by hepatocyte steatosis, ballooning, inflammation and varying degrees of fibrosis from none to cirrhosis. NASH is strongly associated with insulin resistance and metabolic syndrome and thus is recognized as a major public health concern as the most prevalent liver disease. Liver biopsy is the gold standard for a diagnosis of NASH. However, given the large population of patients at risk for NASH, liver biopsy is not a practical method for determining which patients may benefit from NASH therapy. Non-invasive methods to estimate inflammation and fibrosis are in clinical use, but there remains a dichotomy between gold standard inclusion criteria and end points that are utilized in clinical trials and real world diagnostic methods that are more common in clinical practice. Thus, the investigators would like to conduct an observational study to head-to-head compare the non-invasive methods and liver biopsy in differential liver steatosis and liver biopsy in a real-world setting. Also, by following up patients for a relatively long time (proposed 10 years), the investigators can present the natural history of disease progression.