The energetics of childhood: Current knowledge and insights into human variation, evolution, and health

Area of Science:

• Human evolutionary biology
• Pediatric energetics
• Biological anthropology

Background:

• Metabolic energy is a fundamental limiting resource for life, influencing evolutionary history and current human adaptation.
• Human energetics research has a long history, but the specific energetics of childhood remain underexplored.
• Childhood is critical for human life history evolution and development, sensitive to environmental factors.

Purpose of the Study:

• To review current knowledge on childhood energy acquisition and utilization across diverse human populations.
• To explore the applications of childhood energetics in understanding human variation, evolution, and health.
• To identify future research directions in the field of pediatric energetics.

Main Methods:

• Literature review synthesizing existing research on human childhood energetics.
• Analysis of trade-offs and constraints in childhood energy expenditure.
• Integration of recent advancements in understanding the energetics of specific physiological systems (e.g., immune, brain, gut).

Main Results:

• Evidence supports a model of trade-offs and constraints governing childhood energy expenditure.
• Advancements in understanding the energetics of the immune system, brain, and gut offer new insights.
• Childhood energetics significantly influences human variation, extended subadulthood, and overall health trajectories.

Conclusions:

• Understanding childhood energy dynamics is key to deciphering human evolutionary uniqueness and developmental plasticity.
• The energetics of childhood provides critical insights into variations in development, phenotype, and health across the lifespan.
• Further research is needed to fully elucidate the complexities of pediatric energy balance and its evolutionary implications.