What Alcohol Does to Your Body, Brain & Health | Huberman Lab Podcast #86

Memory

Alcohol significantly disrupts memory formation, leading to phenomena like blackouts, where individuals engage in activities without recalling them later. Andrew Huberman explains that during such episodes, the hippocampus, crucial for memory, is inactive, causing a complete memory lapse despite the person being awake and active 1. This memory disruption is linked to alcohol's effect on the brain's prefrontal cortex, which initially shuts down, impairing judgment and memory control 2.

Many people think that blacking out is passing out, but blackout drunk is when people drink and they're talking and doing things, sometimes, sadly or tragically, they'll often drive home or walk home.

--- Andrew Huberman

Understanding these effects is crucial for recognizing the risks associated with alcohol consumption and potential predispositions to alcoholism.

   

Mood

Alcohol consumption significantly impacts mood by altering serotonin levels, initially causing a temporary mood boost followed by a decline. Andrew Huberman describes how alcohol's conversion into acetaldehyde disrupts serotonin pathways, leading to mood fluctuations and increased impulsivity 3. This disruption can result in a cycle of drinking to regain the initial mood elevation, often seen in individuals with a genetic predisposition to alcoholism 4.

Alcohol, when we ingest it and it's converted into acetaldehyde, it goes and that acetaldehyde acts as a toxin at the very synapses, the connections between these serotonergic neurons and lots of other neurons.

--- Andrew Huberman

These mood alterations highlight the complex relationship between alcohol and mental health.

   

Neurodegeneration

Even low to moderate alcohol consumption poses a risk for neurodegeneration, reducing brain thickness and affecting cognitive functions. Andrew Huberman cites studies showing that alcohol consumption correlates with a decrease in cortical thickness and gray matter volume, even at low levels 5. This shrinkage impacts areas responsible for memory and decision-making, emphasizing the importance of minimizing alcohol intake to protect brain health 6.

A few other things about alcohol and health. At the beginning of the episode, I referenced a study showing that indeed not just heavy alcohol consumption of 12 to 24 or more drinks per week, but also light to moderate alcohol consumption of any type, wine, beer, spirits, etc., does reduce the thickness of the brain.

--- Andrew Huberman

These findings underscore the potential long-term cognitive risks associated with alcohol.