Inedia (Living Without Food): Systematic Evidence Review

Inedia — survival without food or water, sometimes claimed as sustained by the Eucharist alone — is among the most extraordinary claims in Catholic mysticism. It is also the claim with the largest body of controlled investigative literature.

The 2020 Systematic Review

A peer-reviewed study published in ScienceDirect (2020) conducted the first comprehensive systematic review of investigated inedia claims. Researchers identified 47 eligible investigations of 38 individual claimants across multiple centuries and religious traditions. Key findings: 1) no investigation met criteria for rigorous controlled verification of anomalous survival — every study had methodological gaps including uncontrolled access, family-home monitoring, or inadequate physical measurement; 2) of the 11 cases initially assessed as 'anomalous,' none held up under methodological scrutiny; 3) fraud was positively established in 10 cases; 4) hysterical or psychosomatic mechanisms explained a further subset.

Application to Specific Cases

For Therese Neumann: the 1927 Seidl observation showed weight patterns inconsistent with total abstinence; she refused all subsequent testing. For Marthe Robin: no controlled monitoring was ever conducted; she declined hospital observation. For historical cases: monitoring methods available before the twentieth century were insufficient to detect sophisticated covert food consumption.

Medical Consensus

Human physiology does not support survival without water for more than approximately three to five days, or without food for more than approximately forty to seventy days (depending on fat reserves). No mechanism exists by which Eucharistic reception (a few grams of wheat flour) could supply caloric requirements for decades. The inedia claim, as made by the major saintly claimants, is physiologically impossible under known biology.