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Deforestation and habitat fragmentation are known as the chief drivers of biodiversity loss. Less is known about the condition of species and individuals that remain in disturbed habitats. Theory predicts that resources are more limited after compared with before fragment isolation. Thus, we assessed how body condition of individual birds' changes in response to forest fragment isolation. We compared weights of the same individually banded birds caught in mist nets within 5 years before and after fragment isolation and assessed the population‐level changes of three species at the Biological Dynamics of Forest Fragments Project in the Brazilian Amazon. We predicted that fragment isolation would result in reduced weight for all bird species. Out of the 3466 bird mist net captures before and after isolation in the 1980s and the 2150 birds captured before and after re‐isolation of fragments in the 2010s, only 73 adult …