Has alcohol been examined as a possible cause of alzehmeir or is the alcohol lobby undermining such a study?

By examining myself I see that when I abide by the rule of one drink a day, I usually become forgetful after about the fourth day. I also become more irritable and am no longer the happy go lucky guy that I think I am. I have to exact myself a lot more to have simple tasks get done. I wonder if this is not what happens to alzehmeir patients on a grand scale?