"Two samples were used, each utilising a different variable for alcohol usage: self reported average weekly consumption over the past year and self reported con

"Two samples were used, each utilising a different variable for alcohol usage: self reported average weekly consumption over the past year and self reported consumption on the heaviest day in the past week" I started to question the study a when I saw self reported. I would really like to get to the bottom of this is # of drinks a day and health. What is the true number of drinks/day that cause damage? I vaguely remember Checholvakia study that made the partipiciants bring back the cork, so the researchers knew they drank the alcohol, and didn't sell the bottles. But even then--they could have poured out the liquor? I gave a weird feeling no drinks/day is best? I should be dead--yes--antidotal.