In people who have had vertical sleeve gastrectomy, those who feel fuller in the evening compared to the morning after meals tend to lose less weight one year after surgery, based on a measurable...

We analyzed the available evidence and found that, in people who’ve had gastric sleeve surgery, feeling fuller in the evening compared to the morning after meals is linked to less weight loss one year after surgery [1]. This observation comes from a small group of patients, and no studies have contradicted this pattern so far. What we’ve found so far suggests that evening fullness may be associated with slower or reduced weight loss, but we don’t know why. It’s possible that people who feel more full later in the day eat less overall, or perhaps their bodies respond differently to food timing. We also don’t know if this fullness is caused by changes in stomach size, hormone levels, eating habits, or something else. The evidence doesn’t show that evening fullness causes less weight loss — only that the two are connected in this group. Because this is based on just one small study, we can’t say if this pattern holds for everyone. More research is needed to understand whether this link is consistent across different people, and whether adjusting meal timing or portion sizes might help. For now, if you’ve had gastric sleeve surgery and notice you feel much fuller in the evening than in the morning, it might be worth paying attention to your eating patterns — not because evening fullness is bad, but because it could be a signal about how your body is adapting. Tracking when you feel full and how much you eat at different times of day could help you and your care team make better-informed choices.