Germ theory is scientifically proven (microbes cause diseases), whereas terrain theory, which attributes diseases solely to an internal or nutritional imbalance while denying the impact of pathogens, is refuted.

noli's read

Andrea Love correctly points out that germ theory rests on a solid global scientific consensus and centuries of observational and experimental data. Historical figures like Robert Koch, through his experimental postulates, scientifically demonstrated this direct causal link between an external microbe and an alteration of health. However, from a perspective of overall well-being, the idea of the “terrain”—that is, the state of our natural defenses, our microbiota, and our nutrition—retains capital importance. Modern observational studies confirm that the quality of our diet and stress management directly influence our body's ability to defend itself. Thus, while it is scientifically erroneous to deny the existence and impact of microbes, contemporary research does not oppose germs to the terrain, but rather shows how our internal balance determines our resistance to them.

the sources

No named source held this one up — that absence is part of the verdict.