Reasoning pattern · logic
A category error assigns a property, inference or mechanism to the wrong class of objects or phenomena—for example treating all forms of 'radiation' as though they share the same interaction physics.
Shared language does not guarantee shared mechanism. Before transferring a risk or explanation, check whether the compared phenomena actually belong to the same causal category.
In practice
5G uses non-ionizing radiofrequency fields, but that does not by itself settle long-term cancer risk. Direct 5G-specific cancer epidemiology is still immature, broader human RF evidence has not shown increased risk for the best-studied tumours, and positive animal findings remain important but methodologically disputed. Ordinary 5G exposure has not been shown to cause cancer.
Diet changes renal acid load and can substantially change urine pH, but blood pH in healthy people is tightly regulated by respiratory and renal physiology. Human evidence does not support using alkaline diets or alkaline water to prevent or treat cancer by alkalizing the blood.
Microwave ovens use radiofrequency electromagnetic radiation to heat food, but microwaves are non-ionizing: their photons do not carry enough energy to ionize atoms in the way X-rays or gamma rays can. Absorbed microwave energy becomes heat and does not make food radioactive. High microwave exposure can injure tissue through heating, which is why ovens are shielded, interlocked and subject to leakage limits; a damaged oven should not be treated as equivalent to normal operation.
Typical household Wi-Fi exposure is low, and human RF studies have not shown increased risk for the best-studied cancers. Experimental-animal evidence includes tumour findings, but the strength of that evidence and its translation to human household Wi-Fi are disputed. Cancer from normal household Wi-Fi exposure has not been demonstrated.
The Wim Hof Method has produced measurable physiological effects in small controlled studies. A 2014 randomized endotoxemia experiment showed that trained healthy volunteers could increase epinephrine and alter inflammatory cytokine responses. A 2024 systematic review found promising inflammatory signals, but also judged the underlying studies very low quality, small, heterogeneous and at very high risk of bias. That is not equivalent to proving treatment efficacy across diseases, and cold-water exposure has real safety risks.