Guiness and bs levels

I know I have to test to see individual effect but I was wondering if anyone had any experience of the effects of drinking Guiness on their bs levels?

I mean the stuff in the can with a widget.

Anyone?

I'm laying off the sauce at moment as I realise it is not a good idea for me to have bottles of whiskey laying around due to lack of restraint on my part.

Think I may switch to the odd can of the black stuff.