Thanks Michelle for a post on a very interesting article. However, I tried taking malic acid when I was suffering from candidasis induced chronic fatigue. Despite taking high doses of malic acid I perceived no improvement in my condition. It is my supposition that tartaric acid displaces malic acid in the Kreb's Cycle. The chronic fatigue is not caused by a shortage of malic acid. The tartaric acid simply "pushes" the malic acid out of the way.
I would not discourage others from trying malic acid based on my experience. Malic acid is an inexpensive suppliment. Perhaps others will have a better outcome than I did.
On the other hand, I do not believe that tartaric acid is a product of human metabolism. Therefore a large amount of tartaric acid in the urine can only come from a foreign organism, such as candida albicans.