Physical inactivity contributes to multiple chronic disease pathways.

This page isolates one claim from the wider argument of The Human OS Manual.

The classification describes the evidence supporting this claim, not the Human OS framework as a whole.

Booth, Roberts, and Laye review evidence linking physical inactivity with multiple chronic disease mechanisms and outcomes.

This does not mean that inactivity explains every chronic disease, or that exercise alone resolves the broader operating conditions discussed in The Human OS Manual.

This claim supports the under-challenged-body side of the Chapter 2 argument. It does not make exercise the complete answer to evolutionary disparity or to chronic disease.

Broad, mature principles of human biology, behavior, or regulation supported across a substantial body of research.

Sources are listed according to the role they play in this claim. One source may provide direct support, another may explain a mechanism, establish a limitation, or prevent an interpretation from becoming broader than the evidence allows.

The printed book preserves the claim inside the argument that gives it meaning. These references connect the current digital record to the first-edition evidence trail.

This claim connects to the following parts of the Human OS architecture. The module labels locate the claim inside the framework; they do not imply that the research source validates the architecture itself.