This doesn't seem possible, something doesn't add up. Even if she is exaggerating it's a bad situation.
It is generally accepted that a human can not survive without food for 4-6 weeks, and even if she is on a strict liquid diet, the fetus is starving for critical nutrients that can only be absorbed through the intestines, from food.
This is one of the few times that I recommend going to the hospital emergency room. NOW. Go NOW. Your baby could be permanently damaged because of this.
I hope your wife is not obsessed with body building so that it affects the development of your child. A body building forum is not the best place to get this sort of advice, and you baby needs more than Curezone right now.
Your baby could end up "challenged for life" from fetal nutrient deficiency.