There would be none:

"..but cannot be used by living organisms as a source of energy because it cannot be phosphorylated by hexokinase, the first enzyme in the glycolysis pathway. "

https://en.wikipedia.org/wiki/L-Glucose

EDIT: Ok, yeah, sorry. I'm sure some bacteria out there could do something with it and make you have an upset stomach. But it's not very likely.

Nature laughs at "not very likely".. We gotta get used to this as a species.