Physiological Sink Capacity. A formal safe-load framework for disease sub-regressor management

This manuscript introduces Physiological Sink Capacity (PSC) as a formal safe-load framework for chronic disease prevention, mechanistic reversal, and disease sub-regressor management. The central premise is that chronic disease risk is not driven only by excessive pathological fluxes—such as glucose, fatty acids, acid load, inflammatory debris, cholesterol, heat, or damaged cellular material—but also by failure of the physiological systems that safely absorb, buffer, store, convert, export, clear, or repair those loads.

PSC is defined as a finite, regulated, observable, and intervention-modifiable capacity that lowers exposure of vulnerable compartments to a stressor faster than that stressor accumulates. The manuscript formalizes this concept using a flux–access–capacity–quality–headroom–emptying–repair model, distinguishing true sinks from chemical buffer-sinks, clearance/export sinks, repair sinks, access infrastructure, capacitance/dilution reservoirs, sink-quality modifiers, and pseudo-sinks.

The review maps candidate sink systems across skeletal muscle, adipose tissue, liver, kidney, vascular/endothelial systems, bicarbonate and acid-base buffering, HDL-mediated cholesterol efflux, macrophage efferocytosis, proteostasis/autophagy/mitophagy, glymphatic clearance, gut fiber/microbiome/bile-acid systems, thermal/plasma-volume adaptation, bone, and extracellular matrix remodeling. It also clarifies what should not automatically be called a sink, including capillaries, HDL-C concentration, plasma volume, chronic bone buffering, hepatic steatosis, high ferritin, fibrosis, and visceral/ectopic fat.

This work extends the War Map / Sub-Regressor framework by proposing physiological sink capacity as a causal-operational layer of sub-regressor management. In this framing, some sub-regressors are pathological excesses to suppress, while others are lost protective capacities to rebuild. The manuscript therefore shifts disease reasoning from biomarker suppression alone toward flux–capacity–repair engineering.

This is a conceptual scoping review and rapid targeted evidence map, reported using PRISMA-ScR and PRISMA 2020 principles where applicable. It is not a meta-analysis, clinical guideline, or validated risk calculator. The purpose is to define a falsifiable framework, classify candidate sink systems, identify measurable proxies, and outline how future sink-capacity trials could test whether increasing safe-load capacity reduces vulnerable-compartment exposure and downstream disease-relevant damage.