A new study from the University of Oulu suggests that the size of human breasts may be linked to infant survivability rather than purely evolutionary attraction factors.
A recent study led by bioarchaeologist Juho-Antti Junno at the University of Oulu has shed light on the evolutionary purpose of large breasts in humans, a characteristic that sets us apart from other primates. While it has been previously theorized that breast size serves as a fat storage mechanism or as a sexual attraction feature, the study posits that the dimensions and surface temperature of breasts may play a critical role in the survival of infants, especially in preventing hypothermia in newborns.
The research indicates that a significant portion of breasts consists of fatty tissue, which raises the possibility that they evolved not only for aesthetic appeal but also to serve a functional purpose regarding heat retention for infants. As newborns are particularly vulnerable to hypothermia, having a warm surface area contributes positively to their chances of survival. This new perspective suggests that breast size could be an evolutionary adaptation designed to enhance the warmth and safety of newborns, rather than solely being a trait intended to attract mates.
The findings challenge previous assumptions about breast size and its evolutionary significance, suggesting that such traits may serve multiple roles. Junno's commentary emphasizes that traits originally deemed decorative might have deeper biological implications, paralleling how peacock tails, while ornamental, also influence mating success. As this research continues to develop, it opens up further inquiries into the evolutionary strategies that have shaped human anatomical features.
