Fatty liver, also known as non-alcoholic fatty liver disease (NAFLD), is the most common liver condition in the U.S. and a key indicator of metabolic dysfunction. It's characterized by fat accumulation in liver cells, even in people who drink little to no alcohol. If left untreated, it can progress to NASH (non-alcoholic steatohepatitis), fibrosis, or cirrhosis. Functional medicine views fatty liver as a reversible condition driven by poor blood sugar regulation, inflammation, mitochondrial dysfunction, and toxin overload. By correcting diet, addressing insulin resistance, and supporting liver detox pathways, patients often see significant improvement or full reversal.