I know even drinking a single beer a day, you affect mouth, throat, stomach, etc. increasing possibility of developing cancer in those areas manyfold. In that sense it would be better to drink 7 beers one day a week, better than a beer a day.
Do you have any references?) 7 beers in one day will cause much more harm. Poor poor liver that will have do 7 times more work in one period of time. By the way alcohol with gas (like beer) is bad for your pancreas. So it's not a good idea to drink a lot of alcohol but rarely.