Drinking sugary drinks with high fructose corn syrup every day for just two weeks can start packing fat into your liver — and the more you drink, the worse it gets, even if you're young and not overweight.

What we've found so far suggests that drinking high fructose corn syrup-sweetened beverages daily for two weeks may increase liver fat in young adults, even among those who are not overweight [1]. The evidence we’ve reviewed leans toward this pattern, with all 54 supporting assertions pointing to a link between daily consumption of these drinks and rising liver fat over a short period. Our analysis of the available research shows that even brief exposure—just two weeks—could begin to affect liver health [1]. The evidence indicates that the amount of sugary drink consumed matters: the more someone drinks, the greater the increase in liver fat appears to be [1]. This was observed in young adults, a group often assumed to be at lower risk due to age and body weight. We want to be clear: this is what we’ve found so far, based on the data we’ve analyzed. We’re not saying this happens in every case or that we’ve uncovered the full picture. But the consistency across all 54 assertions is notable—none of the evidence we reviewed contradicted this trend [1]. Still, our current analysis is limited to what’s been studied and reported. We can’t say how long these effects last, whether they lead to long-term health issues, or if other factors might influence the outcome. We also don’t have data from studies that refute this, so our understanding may shift as more evidence becomes available. For now, the takeaway is simple: if you’re drinking sugary beverages with high fructose corn syrup every day, even for a short time, it might be adding fat to your liver—especially if you’re doing it regularly. Young and healthy doesn’t appear to fully protect against this effect, based on what we’ve seen so far.