“Alcohol kills brain cells.”

The notion that alcohol directly kills brain cells is a persistent misconception, likely stemming from the obvious and immediate effects of intoxication. When someone experiences slurred speech, impaired coordination, or memory lapses after drinking, it's easy to assume that brain cells are being destroyed. This belief may also have roots in historical movements, such as the temperance movement, which aimed to highlight the dangers of alcohol consumption.

However, scientific evidence reveals a more nuanced picture. Heavy alcohol consumption does not typically cause brain cells (neurons) to die outright. Instead, alcohol acts as a neurotoxin that primarily damages the dendrites, which are the delicate, branching extensions of neurons responsible for receiving and transmitting messages. This damage disrupts the intricate communication network within the brain, leading to the cognitive and motor impairments associated with heavy drinking.

Over time, chronic and excessive alcohol use can lead to significant structural changes, including brain atrophy or shrinkage, particularly in areas vital for memory and decision-making. Furthermore, heavy drinking can interfere with the brain's ability to create new neurons, a process called neurogenesis. Conditions like Wernicke-Korsakoff syndrome, often seen in individuals with severe alcohol dependence, result from a thiamine deficiency that causes severe and sometimes permanent brain damage, affecting memory and coordination. While the myth of "killed" brain cells isn't accurate, the reality of alcohol's damaging impact on brain structure and function is still a serious concern.