Education Is Three Determinants of Health: Medical Literacy, Informed Choice, and Health Outcomes  

Education is classified as a social determinant of health, yet its monolithic placement hides a functional triad. If determinants act through streams, and education through three, it cannot remain one. With set-theoretic reasoning in plain prose, we show that education divides into general education (GE), health literacy (HL), and medical literacy (ML). GE shapes social opportunity; HL guides prevention; ML enables recovery. A simple healthy ↔ morbid flow makes the HL-ML divide explicit: HL dampens entry into illness, and ML hastens return to health. Beyond mechanism, HL and ML differ in time scale and life-course leverage: HL operates upstream with diffuse, long-latency effects that accrue early in life, whereas ML acts peri-morbidly, yielding nearterm, attributable effects on recovery that dominate later in life. Medical literacy is not merely conceptual: it is empirically instantiated in shared decision-making, patient decision aids, decision-quality measurement, patient activation, and risk-communication practices that produce observable, near-term effects during clinical recovery. Conflating these distinct temporal roles obscures both causal structure and practical leverage, further substantiating and motivating a tripartite classification of education determinants.