A brief history of food: when the rich eat white bread and buy formula, the poor eat brown bread and breast-feed; then they trade places.)
Some of the magical thinking about breast-feeding stems from a common misconception. Even many doctors believe that breast milk is full of maternal antibodies that get absorbed into the baby’s bloodstream, says Sydney Spiesel, a clinical professor of pediatrics at Yale University’s School of Medicine. That is how it works for most mammals. But in humans, the process is more pedestrian, and less powerful. A human baby is born with antibodies already in place, having absorbed them from the placenta. Breast milk dumps another layer of antibodies, primarily secretory IgA, directly into the baby’s gastrointestinal tract. As the baby is nursing, these extra antibodies provide some added protection against infection, but they never get into the blood.
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posted by Astro Zombie at 1:22 PM on March 16 [26 favorites has favorites]