Here's the best theory I've read....morning sickness induces an artificial famine in the first trimester. The body responds to famine by growing an ENORMOUS placenta that gathers in every last nutrient. In Grok's time, that was a big advantage...in the second two trimesters, the body grows a big healthy baby through that healthy placenta.
Originally Posted by queen_sheba
When I was a student midwife, I would weigh every placenta....sure enough, the weight correlated with degree of first trimester sickness!
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food