Hi Dobbs,
It's actually very simple. One of the biggest problems for most diabetics is that the liver over-produces glucose, usually while we are asleep but also in smaller quantities during the day. The liver also has the important job of filtering out alcohol from your bloodstream. It seems to operate on a list of priorities, where clearing alcohol takes priority over everything else (proof that everyone's liver is male because it can't multi-task). This means that, while it is dealing with your whisky (or a glass of red in my case) it isn't producing glucose, so your BS level is lower. My memory of the details is a bit hazy (maybe a glass too many!) but I think it takes the liver 1 hour to clear 1 unit of ancohol. So a small whisky would keep it busy for 4 hours, two glasses 8 hours, etc.