Marx’s writings on Ireland are widely known, but less appreciated is theircentrality to the formation of his ecological thought. We show how Marx’s understand-ing of metabolic rift evolved in line with his writings on colonial Ireland, revealing a con-cept more holistic than the“classic”metabolic rift of the soil. We recover and extendthis concept to thecorporealmetabolic rift, showing how both are inherent in Marx’svarious writings on Ireland. Whilst the rift of the soil concerns the extraction and con-sumption of organic soil constituents, the corporeal rift describes processes of depopula-tion, and their effects on demography and family formation. These“rifted”processesare interconnected such that depleted soil impacts on the health of those who consumefood grown on those“rifted”soils. We argue that the presence of these rifts substanti-ates Ireland’s inability to sustain itself both economically and organically, which deter-mined its persistent post-Famine underdevelopment.