Twenty years ago, when I was pregnant with my first child, I transformed into a total health nut. A lifelong couch potato, I started exercising, enrolled in Lamaze classes and even took vitamins for the first time. I halted my consumption of caffeine, Doritos, Spam and sushi. I began scrutinizing every additive and preservative listed in the teeny-tiny font on each item of my grocery list.
Now,…