When obese teens drink a sugary drink with fructose, their hunger hormone doesn't go down like it does in lean teens — meaning their bodies don't signal fullness as well.

What we've found so far suggests that fructose may not reduce hunger signals as effectively in obese teens compared to lean teens. When obese teens consume a sugary drink containing fructose, their hunger hormone levels do not decrease in the same way they do in lean teens [1]. Our analysis of the available research shows that the body’s response to fructose differs between obese and lean adolescents. In lean teens, drinking a fructose-containing beverage appears to trigger a drop in the hunger hormone, which is a signal that the body is starting to feel full. But in obese teens, this drop does not happen to the same extent [1]. This means the fullness signal may be weaker or delayed, which could influence how much they eat afterward. The evidence we've reviewed leans toward the idea that metabolic responses to fructose are not the same across all teens and may depend on body weight status. So far, we have identified 54.0 assertions supporting this pattern and none that contradict it [1]. However, we base this on a single key assertion describing the effect, and we have not yet reviewed broader factors like long-term eating behaviors, overall diet, or hormonal health. We don’t yet know whether this difference in hormone response directly affects weight gain or if it can be changed over time with diet or lifestyle adjustments. Our current analysis only captures part of a complex picture. Practical takeaway: For some teens, especially those with obesity, sugary drinks might not trigger the same "I’m full" signal, which could make it harder to naturally control how much they eat. Choosing drinks with less added sugar might help support better appetite control.