This is the longevity claim of the case: that the coordinated regimen the Battle Creek Sanitarium called biologic living, or the Battle Creek Idea, would keep a person well and extend life. Kellogg presented the system as a unified physiologic program in The Battle Creek Sanitarium System (1908) and detailed its colon-hygiene component in Colon Hygiene (1916). The endpoint is classified as mechanism-only and the status as untested: the claim was advanced from the autointoxication mechanism and from clinical impression at the Sanitarium, not from any controlled study comparing the lifespan of regimen-followers against controls. No such trial was run. The individual components vary in independent merit (abstinence from alcohol and tobacco and regular exercise have later evidence of benefit; the colon-hygiene rationale does not), but the specific packaged claim, that biologic living as a system prolongs life by clearing intestinal autointoxication, rests on a mechanism that was subsequently refuted (see [[colon-autointoxication-shortens-life]]). It is recorded here as untested rather than refuted because the life-extension endpoint itself was never put to a controlled test.