I think "guidelines" set regarding units of alcohol are unrealistic and need to be adjusted for size/weight, general health, etc.
When I started university, I drank nearly every night. Mostly beer with the occasional shot. When I graduated and started my career, I was drinking at least a bottle of wine each night. After a while of that, I realized it wasn't doing me any good, and I stopped drinking during the week. I have at least a bottle of wine a night on Fri/Sat/Sun, but all of my blood tests are sickeningly normal. My life is high-stress, and this helps me balance.
Just last year, I had to put my lovely cat to sleep on a Tuesday, and I didn't touch a drop until Friday (similar situations with past cats/crises led me straight to the corkscrew). Quite honestly, some people just handle alcohol better than others (I mean, look at Keith Richards with all his years of drink/drugs/cigs he'll outlive us all!). I'm by no means a health nut love cheeseburgers and steak -- but I drink a lot of ice water, no soda, no artificial sweeteners, never smoked anything (though I now enjoy a tasty edible from Colorado every now and then, if you know what I mean). My doctor calls my cholesterol levels perfect, so maybe I'm a good example of The French Paradox!
Different strokes for different folks. Have a lovely weekend, everyone!