Well don't know if this is worth any brownie points. I could only find two pieces of interesting information related to malic acid.
(1)Apple juice (high in malic acid)acts as a solvent in the bile to weaken adhesions between solid globules.
(2)Malic acid (as magnesium malate) which is particularly effective at binding to and removing aluminum, a common—yet toxic—metal often found in the food supply. Hmmm..I wonder if this has possible applications in preventing or slowing down the progression of Alzheimer's disease.