People with specific combinations of genetic variants in the USF1 and LIPC genes have been observed to have higher levels of fat in their liver, as measured by a specialized imaging technique, which...

We analyzed the available evidence and found that 33 studies or assertions support the idea that specific combinations of variants in the USF1 and LIPC genes are linked to higher levels of fat in the liver among Caucasians. No studies in our review contradicted this observation. These findings are based on measurements taken using specialized imaging techniques that can detect fat buildup in the liver, a condition sometimes called fatty liver disease [1]. What we’ve found so far suggests that people with certain versions of these two genes may be more likely to store extra fat in their liver compared to others. The USF1 gene is involved in how the body regulates fat and sugar metabolism, and LIPC helps control how fat is processed in the blood. When certain changes occur in both genes together, the body’s fat handling may shift in a way that leads to more fat accumulating in the liver. This pattern was consistently seen across multiple observations in Caucasian populations, but we don’t yet know how strong this link is for individuals or how it interacts with diet, activity, or other genes. We don’t know if these gene variants cause liver fat to rise, or if other factors are involved. The evidence doesn’t tell us whether having these variants guarantees higher liver fat, or if lifestyle changes can offset the effect. We also don’t know how common these gene combinations are, or how much liver fat increases on average. The evidence we’ve reviewed leans toward a connection between these specific USF1 and LIPC gene variants and increased liver fat in Caucasians, but it’s not enough to say this applies to everyone with these variants. More research is needed to understand how much this matters in real life. If you’re Caucasian and concerned about liver health, knowing your genes isn’t the most important step — maintaining a healthy weight, staying active, and limiting added sugars and alcohol are actions that have stronger, clearer benefits for your liver.