Katie Hinde and Erin Sullivan are both awesome!

A recent Nature Outlook commentary summarized some cutting edge research in milk composition and lactational programming. Though not mentioned by name, the work of Drs. Katie Hinde and Erin Sullivan is highlighted:
"In rhesus macaques, sons drink milk with a higher concentration of cortisol, a hormone that modulates metabolism, even though their mothers have no more cortisol circulating in their blood than when nursing a daughter. It is unclear whether this cortisol-related sex difference has a function. But there are clues: young male macaques that consume milk containing high levels of the hormone develop bold behaviour, whereas cortisol in milk appears to have no influence on female macaque infants. Whether this has a parallel in humans is yet to be determined."

Dr. Hinde also recently published a paper (early view at Journal of Medical Primatology) with Dr. Lin Tao, a colleague of mine at the College of Dentistry at the University of Illinois at Chicago: Species diversity and relative abundance of lactic acid bacteria in the milk of rhesus monkeys (Macaca mulatta)

Cortisol concentrations in milk predict temperament in offspring!

There is some tremendously exciting work being done lately on programming elements of milk: early life influences on milk composition, effects of milk composition on development, etc. Here's yet another fascinating study, co-authored by BANDIT members Erin Sullivan and Katie Hinde along with Sally Mendoza and John Capitanio, all of the University of California at Davis: Cortisol concentrations in the milk of rhesus monkey mothers are associated with confident temperament in sons, but not daughters

Abstract
One pathway by which infant mammals gain information about their environment is through ingestion of milk. We assessed the relationship between stress-induced cortisol concentrations in milk, maternal and offspring plasma, and offspring temperament in rhesus monkeys. Milk was collected from mothers after a brief separation from their infants at 3–4 months postpartum, and blood was drawn at this time for both mothers and infants. Offspring temperament was measured at the end of a 25-hr assessment. Cortisol concentrations in milk were in a range comparable to those found in saliva, and were positively correlated with maternal plasma levels. Mothers of males had higher cortisol concentrations in milk than did mothers of females, and cortisol concentrations in maternal milk were related to a Confident temperament factor in sons, but not daughters. This study provides the first evidence that naturally occurring variation in endogenous glucocorticoid concentrations in milk are associated with infant temperament.