Many people mistakenly believe that fatty liver disease only affects those who are overweight or obese. However, individuals with a normal body weight can also develop fatty liver—a condition known as ‘lean NAFLD’ (non-alcoholic fatty liver disease). Research shows that despite having a normal BMI, lean individuals may still accumulate visceral fat, experience insulin resistance, or suffer from underlying metabolic abnormalities. Alarmingly, studies indicate that lean NAFLD patients actually face a higher risk of all-cause mortality compared to their obese counterparts. This may be because lean individuals often overlook potential health issues and skip routine check-ups, allowing the disease to silently progress—sometimes advancing to liver fibrosis, cirrhosis, or even liver cancer without noticeable symptoms. Contributing factors include poor dietary habits (e.g., high sugar or fat intake), sedentary lifestyles, rapid weight loss, and genetic predisposition. Therefore, regardless of body size, everyone should prioritize liver health through balanced nutrition, regular physical activity, and periodic screenings such as liver function tests and abdominal ultrasounds for early detection and timely intervention.
很多人误以为脂肪肝只发生在超重或肥胖人群中，但事实上，体型偏瘦的人也可能患上脂肪肝，这种情况被称为‘瘦人脂肪肝’（Lean NAFLD）。研究发现，尽管瘦人脂肪肝患者体重指数（BMI）正常，但他们体内可能存在内脏脂肪堆积、胰岛素抵抗或代谢异常等问题。更令人担忧的是，与肥胖型脂肪肝患者相比，瘦人脂肪肝患者的全因死亡风险反而更高。这可能是因为瘦人往往忽视自身健康问题，缺乏定期体检，导致疾病在无症状状态下悄然进展，甚至发展为肝纤维化、肝硬化或肝癌。此外，瘦人脂肪肝常与不良饮食习惯（如高糖、高脂摄入）、久坐不动、快速减肥或遗传因素相关。因此，无论体型如何，都应重视肝脏健康，保持均衡饮食、规律运动，并定期进行肝功能和腹部超声检查，以便早期发现和干预。
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