MetabolicLoop defines the field as a self-regulating system capable of sustaining and transforming itself through internal operations. In Socioplastics, growth depends on feedback, recalibration, recursion, and selective reuse. The field does not expand linearly; it metabolises its own outputs, absorbs contradiction, redistributes pressure, and converts prior deposits into new structural inputs. MetabolicLoop frames the corpus as an autopoietic cycle in which continuity emerges through internal regulation rather than external command. What persists does so through adaptive self-organisation.