Here is one answer posted in reply to the question of beer etc. when on a LCHF diet.
Eva-Brit Kram posted in Swedish at post
My interpretation of the post is:
Alcohol stops the fat burning process and gives a craving for carbohydrates..A glass of red wine every now and then is ok. After a time on LCHF you will not be as tolerant of alcohol as before. The alcohol pulls down blood sugar and it makes it possible to be very poorly.
Steve Gibson mentioned in his podcast that Chardonnay is his tipple of choice and he also referred to reports that some people on the LCHF diet produce vapours that can trigger a breathalyser false positive.