Add one more thing to the list of worries for pregnant mothers. New research shows that our mothers' diets during pregnancy and breast feeding may be the largest factor in whether we become obese. The flavors we are exposed to while still inside the womb, and during breast feeding, determine what we will eat later in life. Babies whose mothers eat a varied and healthy diet are more open to a wide range of flavors, and tend to eat more healthfully through adulthood. This puts babies fed formula at a disadvantage because formula flavors never change, but breast-fed babies with mothers who eat too many refined and processed foods are also at greater risk. We're pretty sure your pregnant friend craving Ben & Jerry's will appreciate the gentle suggestion to binge on arugula instead.