If you can, it's best to not drink at all. Once it becomes a habit, it's a slippery slope. You might have a bad day and decide you deserve two beers. Then the next day you might think, "It didn't do me any harm having two beers yesterday, I think I'll have two again today. I'll go back to one tomorrow." You might go back to one again the next day, or you might not. The problem is you've loosened your grip on your self-control and it's more likely to happen again in the future. Soon, two beers might become the new norm. Three. Four. Your tolerence and dependence increases and you need more and more to get the same effect.