Comparative energetics of primate fetal growth.
Level 5 - mechanism / opinion, no new human data
Level 5 by design analogy: comparative theoretical and energetic modeling across primate species.
PubMed 12203814 · doi:10.1002/ajhb.10088
What was done
A comparative energetic analysis modeling the daily maternal nonmaintenance energy budget allocated to fetal tissue development across primate species, including humans and other hominids.
What was found
The abstract reports no numerical values or statistical parameters. Larger primates invest a smaller proportion of their daily nonmaintenance energy budget in fetal tissue as their overall energy budget increases. Humans show a proportion of maternal energy investment similar to other apes, combined with a diet quality substantially higher than predicted for body size. This energetic pattern supports higher birthweight, elevated neonatal adiposity, and greater relative brain size at birth compared to all other primates except chimpanzees.
Why it matters
The paper provides an evolutionary energetic framework showing how high human dietary quality buffers maternal metabolic constraints to allow the development of large, fat-buffered, large-brained neonates.
Limits
The study is a theoretical modeling analysis based on cross-species scaling rather than direct physiological energy measurements during pregnancy. The abstract does not report the number of species or sample size analyzed, and no quantitative values are provided.
Cited by
- supports Prior to birth, the rate of brain size increase compared to body size is approximately identical in humans and chimpanzees.