Feeling full and noticing food are not the same process. A new laboratory study offers a useful example of that distinction: snack cues briefly captured attention even when participants had eaten.

Researchers ran two experiments using a rapid visual task. Participants watched a stream of images and tried to identify a neutral target. A photo of a snack appeared either 300 or 900 milliseconds before that target. If the snack image held attention, participants were more likely to miss what came next.

In the first experiment, 183 adults were assigned to tasting, eating until satiated, or not eating before the task. Snack images presented at the shorter interval reduced target detection. The pattern also varied with body mass index and eating state.

The second experiment involved 61 adults across two sessions. After eating, attention to a newly introduced snack declined in the normal-BMI group but remained detectable in the higher-BMI group. Images of the snack participants had just eaten still disrupted attention in both groups.

The careful interpretation is narrower than the headline might suggest. The researchers measured a fraction-of-a-second performance effect in a controlled task. They did not measure how hungry participants felt afterward, what they chose to eat, or whether anyone overate. BMI was a grouping variable, so the experiments do not show that body size caused the difference. The smaller second experiment also makes its subgroup result a finding to test again.

What the study does show is that fullness does not necessarily make food cues disappear from attention. A person can notice food automatically without that moment revealing what they want, what they will choose, or how much they will eat.