What was the result for your TSH test? What symptoms do you have besides weight gain?
The correct answer is that it likely has some effect. From the following link to a scientific study, "Some consensus seems to be developing for alcohol causing a moderate suppression of peripheral serum thyroxine (T4) levels with more significant suppression of triiodothyronine (T3) levels in chronic alcohol users [Table 2].[17,25] In addition, alcohol-dependent individuals may present with a “euthyroid sick syndrome,” evidenced by low levels of T3, high levels of reverse T3 (rT3), and normal levels of T4.[26,27,28]
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3743356/
If you have been tested, and will post your thyroid test results and reference ranges shown on the lab report, we will be glad to make an assessment. Symptoms are even more important than labs results, so please tell us about any symptoms you have.