How much would a person need to drink for alcohol to be the culprit for someone to have gynecomastia?

I agree with the others that there is no know correlation between alcohol intake and gyneomastia. It sounds, however, that you are unsure about what has caused your gynecomastia. A thorough consultation with a boarded plastic surgeon will be of great help, I think.

I am not aware of any study that indicates alcohol as the direct cause of gynecomastia. I believe the problem is the damage that alcohol can do to the liver which then can causegynecomastia (advanced cirrhosis of the liver). 

No, alcohol itself does not cause gynecomastia.  However, excessive alcohol intake over a long time can lead to liver disease (cirrhosis) and the liver disease and associated poor liver function can result in gynecomastia.For more info about gynecomastia, please refer to my website captioned below.Elliot W. Jacobs, MD, FACSNew York City

Thank you for sharing your question. Alcohol is not a known cause of gynecomastia. If you would like a proper diagnosis please see a board certified plastic surgeon for a proper assessment.

Alcohol is not directly known to cause gnaecomastia. If you think you have gynaecomastia, you should consult a board certified cosmetic surgeon.

Steroids, not alcohol, can contribute to gynecomastia.  It can be familial or linked to      hormonal issues.