Table 1 Parallels between models of biological and behavioral immune systems.

From: An adaptive behavioral immune system: a model of population health behavior

Immune system

Level of functioning

Precision function

Variation function

Functional precision

Functional variation

Biological immune system

The cell

The host-defense system

The human microbiome

The host-defense system prioritizes symbionts and organizes the removal of pathogens and parasites

Microbial variability/diversity in the microbiome

Adaptive behavioral immune system

The “Self” (i.e. the individual human being)

Decisions

Habits

Decisions prioritize good habits and organize the removal of bad habits

Variability in one’s healthy habits (i.e. “healthy lifestyle”)