Getting fat would also reduce testosterone synthesis due to increased oxidative stress. (naturaltestosteronebooster.top)
Alcohol interferes with testosterone production in a number of ways, including negative alteration of enzymes involved in testosterone synthesis, suppression of steroidogenesis in the Leydig cells of the testes (yes, your balls), and a down regulation of luteinizing hormone receptors. (rocksolidnutritionandwellness.com)
It also is involved in the production of the luteinizing hormone required for testosterone synthesis in males and regulation of the menstrual cycle and ovulation in females. (aminoacidstudies.org)