A new evolutionary feature of social bonds (Social Physiology). BioBond advances beyond the state of the art by identifying Social Physiology: a cross-domain principle in which physiological homeostasis becomes more efficient in social proximity. While the evolutionary role of sociality through cooperation or threat buffering is well recognized, it has not been directly tested whether social proximity improves core homeostatic regulation in a manner that reduces energetic effort, particularly in systems not traditionally viewed as socially sensitive. Beyond behavioral and ecological advantages, Social Physiology reveals a psycho-biological benefit of sociality that may contribute to the evolution and maintenance of social bonds.
A mechanistic pathway linking bonds to health and longevity. Although strong social ties are widely associated with better health, wellbeing, and longevity, most evidence has been correlational, leaving the physiological mechanisms unclear. BioBond provides a direct, quantifiable demonstration of the immediate homeostatic benefits of social proximity, showing a physiological advantage in glucose metabolism, thermoregulation, and sympathetic activation. Because more efficient regulation in these systems is linked to reduced risk for metabolic and cardiovascular disease, Social Physiology offers a testable mechanism by which social connection may exert health-related benefits by reducing the metabolic effort of homeostasis.
A physiology-grounded account of selective bonding and learning. Existing approaches describe how close relationships are formed and maintained, but they do not fully resolve why social animals are motivated to invest substantial effort and tolerate risks to engage in social interaction when many benefits are long-term. Social Physiology offers an evolutionary solution: immediate physiological gains make social interaction worthwhile in the moment and can accumulate into long-term fitness benefits, aligning proximate motivation with ultimate outcomes. This reframes social animals not as fully autonomous regulators, but as physiologically interdependent organisms.
A cross-system metric and analytic framework (SPG). BioBond introduces Social Physiological Gain (SPG) as a cross-system metric to quantify social enhancement of homeostatic efficiency as continuous, measurable physiological gains with the potential to implement selective bonding. We developed a system-comparable analytic framework and implemented it across distinct homeostatic systems—glucose metabolism, thermoregulation, and sympathetic arousal—enabling a unified test of Social Physiology as a domain-general principle rather than a single-system effect.
A “non-obvious” proof-of-concept in glucose homeostasis. A key breakthrough is demonstrating Social Physiology in glucose homeostasis, a metabolically costly autonomic system not typically conceptualized as socially responsive. Treating glucose regulation as a rigorous proof-of-concept testbed shows that social benefits extend beyond threat buffering or touch and reflect a broader impact on metabolic regulation, with translational implications for pathways linking social connection to metabolic health, including vulnerability to diabetes and related metabolic illness.
