That's a pretty weighty claim. Do babies born via C-section really have lower IQs than those born naturally? What does the article go on to say?
"According to scientists, when women give birth naturally there are higher levels of a special protein in babies’ brains that helps boost intelligence levels as they develop.So according to the Daily Mail, babies born naturally have higher levels of UCP2 in their brains, and this means they have higher IQs. And, as is always the case, the Daily Mail has failed to cite the actual research behind their claim. So, I went ahead and found it for myself1. What do the original authors have to say?
Scientists at Yale University in the US say the increased levels of the protein, called UCP2, in babies born naturally could help foster their short and long term memories – key components of the human IQ – as they grow up."
From their abstract (emphasis added):
"Mitochondrial uncoupling protein 2 (UCP2) is induced by cellular stress and is involved in regulation of fuel utilization, mitochondrial bioenergetics, cell proliferation, neuroprotection and synaptogenesis in the adult brain. Here we show that natural birth in mice triggers UCP2 expression in hippocampal neurons."And from their discussion (again, emphasis added):
"The current data suggests that the induction of Ucp2 by birth -associated physiological stress enables metabolic adaptation to a switch available nutrient utilization that is critical for proper survival and development of hippocampal and other brain neurons."So, in other words, 1) the study was done in mice, and 2) UCP2 levels are correlated with changes in metabolism that were important for brain growth. Nowhere in the paper do the authors mention human babies and nowhere do they mention UCP2 levels having any effect on IQs. One has to wonder whether Sarah Johnson at the Daily Mail actually read the original paper.
Then again, the Daily Mail never really has been good at that science thing. They don't call it the Daily Fail for nothing.
(2012) Ucp2 Induced by Natural Birth Regulates Neuronal Differentiation of the Hippocampus and Related Adult Behavior. PLoS ONE 7(8): e42911. doi:10.1371/journal.pone.0042911