Are you eating enough to fall pregnant?

What is an ovulation "off" switch, and could it be happening to you? If you have been trying for a baby, and it just isn't happening, this might be something to consider - whether you are eating enough to fall pregnant? Are you possibly in an under-eating/over-exercising cycle? Is your body fat % too low to conceive?

I discuss how your hypothalamus can limit or shut down ovulation, otherwise known as hypothalamic amenorrhea, if it perceives the body under physical stress in order to conserve energy.  

And most importantly, what blood tests would be needed, and ultimately, how to fix it.