Fatty Liver Disease (MASLD): Symptoms, Causes, and Treatment

Fatty liver disease — now medically called MASLD — has quietly become the most common liver condition in the world, affecting roughly one in three adults, often without any noticeable symptoms. This guide breaks down why it's been renamed from NAFLD, what actually causes it (diet, insulin resistance, obesity, and more), the early and advanced warning signs to watch for, and how doctors diagnose it.