How and Why Does Metabolism Scale with Body Mass?

Area of Science:

• Physiology
• Evolutionary Biology
• Metabolic Science

Background:

• Current explanations for body size-metabolism links often rely on evolutionarily inert physical constraints.
• Modern metabolic rate and life history studies lack the diverse approaches of earlier foundational work.

Purpose of the Study:

• To highlight the limitations of current explanations for body size and metabolism.
• To advocate for the reintegration of optimization approaches with physiological studies.
• To improve the predictive capacity of metabolic rate and life history research.

Main Methods:

• This study is a conceptual review and theoretical call to action.
• It analyzes the historical divergence between optimization and physiological approaches.
• It synthesizes arguments for their reunification.

Main Results:

• Physical constraint-based explanations for body size-metabolism relationships are evolutionarily limited.
• A gap exists between foundational pluralism and contemporary approaches in metabolic research.
• Reforging links between optimization and physiology is proposed as a path forward.

Conclusions:

• Reintegrating optimization with physiology can overcome the limitations of current models.
• This interdisciplinary approach is crucial for advancing our understanding of metabolic rate and life history.
• Future research should focus on bridging the gap between theoretical optimization and empirical physiology.