Final answer:
Alcohol acts as a diuretic by inhibiting the release of antidiuretic hormone (ADH), resulting in increased urine output and the need to urinate more frequently.
Step-by-step explanation:
Alcohol acts as a diuretic by inhibiting the release of antidiuretic hormone (ADH), which helps to regulate water balance in the body. When ADH is inhibited, the collecting ducts in the kidneys become more impermeable to water, resulting in less water being reabsorbed and more being excreted in the urine.
This increased urine output is why Linda feels the need to urinate more frequently after drinking alcohol. Additionally, consuming multiple beverages, like the two beers in Linda's case, can also increase urine output.