This video discusses the prevalence and dangers of non-alcoholic fatty liver disease (NAFLD), which affects approximately 25% of the population. It explains how excess liver fat can lead to serious health issues like insulin resistance, diabetes, heart disease, and even liver cancer. The video explores the role of visceral fat in NAFLD and provides actionable advice on diet and exercise to prevent and reduce liver fat, emphasizing the benefits of a polyphenol-rich diet and specific exercise routines like aerobic and high-intensity interval training.