Eating a lot of fructose — like from sugary drinks — might mess with how your body uses insulin, making it harder to control blood sugar, and this has been seen in both animals and people.

What we've found so far is limited, but the evidence we've reviewed leans toward high fructose intake being linked to changes in how the body manages insulin. Based on the single assertion we’ve analyzed, consuming large amounts of fructose—such as from sugary drinks—might interfere with insulin function, potentially making it harder to control blood sugar levels [1]. This pattern has been observed in both humans and animals, according to the available claim. Our current analysis shows only one supporting assertion and no studies or claims that refute it. While this suggests a possible connection, we don’t have enough evidence to say how strong or consistent this effect is across different people or conditions. We also can’t determine from this data alone whether fructose directly drives these changes or if other factors, like overall diet or calorie intake, play a role. We’re still building our understanding. At this stage, the evidence we’ve reviewed points in one direction but is far from complete. We don’t yet have a clear picture of how much fructose, over what period, might influence insulin response—or whether cutting back would reverse any effects. Practical takeaway: If you're concerned about blood sugar control, it may be worth paying attention to how much added sugar, especially from sugary drinks, you consume—since fructose is a major component. But based on what we've found so far, we can’t say for sure how big an impact it has for everyone.