Homeostatic capacity—a concept analogous to resilience, strength, buffer, robustness, antifragility, and antifrailty—is the efficiency of an autoregulatory system to maintain functional homeostasis against ubiquitous stressors and entropy. The interaction of homeostatic capacity and stressors determines health. We envision a model for healthy, functional longevity based on evaluating and improving homeostatic capacity.

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