I had a OxyMark Panel done that was sent to an international center for metabolic testing.
It measured everything from OAT,amino acids, antioxidants, oxidative stress, essential fatty acids and iron metabolism. The conclusion was that I was not converting nutrients/food into energy. I have a 3 page report discussing the citric acid cycle.
I have low citric-cycle intermediates which RD mentions regarding Whitney.
The biochemist knew my illness was real without a diagnosis.
I'm sure there are many studies out there. This is what biochemist study.