This is the life-extension promise underlying Grahamism as a whole: that the disease-prevention mechanism Graham described (avoidance of nervous “excitability”) compounds over a lifetime into preserved vigor and a long, disease-free old age. Graham’s career-long lecture and book output extended the disease-prevention claim documented in Shryock 1931, the cholera-era promise that a plain diet and total abstinence from stimulants defends against illness, into a standing promise that strict adherence over a lifetime preserves health and vigor into old age. It is classified as mechanism_only because Graham offered no measured cohort, life-table, or outcome data, only the same posited excitability mechanism carried to its logical conclusion. It is recorded as untested rather than refuted: no controlled study was ever run against the specific claim, for or against, and the archive does not treat Graham’s own death at fifty-seven as a controlled disconfirmation of a population-level claim, only as the striking fact that the doctrine’s chief author and sole authority did not himself reach the extreme old age his system promised. The year_made of 1837 is anchored to the founding of The Graham Journal of Health and Longevity in that year (NHA Graham Timeline 2023): the periodical Graham co-founded with David Campbell put the longevity promise on the masthead of a publication devoted to promoting his own system, the most precisely dated statement of the claim in the bundle; his book-length statement of the system survives to the archive only as an 1877 reprint whose original publication year is unresolved.