I'm one of the naughty ones. I'm not saying listen to me though! I have had a glass or two of wine on a weekend in the past and not been out of ketosis or come off plan, have not felt sick and lost as much as when I never had wine.
Did it last time I did cambridge and lost a stone a month still.
I'm not saying this is good though, just saying it kind of works for me. But I think it's a risk. Angelofthenorth is right and I too should be following her advise!