Irritates the heck out of me when due dates are changed because of 2nd trimester ultrasounds. It's like changing a kid's graduation date from school based on how tall he is.
First trimester ultrasound is VERY accurate at figuring out due dates because the structural features appear in a very consistent way and at a very consistent rate across all embryos. Second trimester ultrasound is way too dependent on genes and mom's diet.
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