I disagree. I have had adrenal fatigue for the past 2 years and it had nothing to do with under-eating. It was brought on by a case of malaria. I have always made sure to get plenty of calories in my diet as I learned my lesson many years back that starving yourself leads to multiple health problems. However, the meat and veggies diet (that is pretty much inherently calorie restricted) certainly isn't helping matters.
Regardless of mainstream medicine, I have no doubt that adrenal fatigue is a very real problem.