If you are a reasonably big drinker, I think it would be very difficult to suddenly cut down to zero. And why just for a year? What about at the end of that year? Do you hope the habit has just stuck and you don't return to your old ways?
I think it depends totally on the quantity being drunk on each night. For example, I would consider my dad to be a very moderate drinker indeed, and he has a glass of wine each night with his evening meal.