Week 3 of 7: Your Brain on Alcohol 🧠

Some people take their first drink and feel nothing much or maybe a warm, slightly dizzy social experience. Others take their first drink and, for the first time, feel completely normal. Like they’ve just found what has been missing all their lives.

That difference matters more than most people realise. And it goes a long way toward explaining why addiction takes hold of some people and not others.

Researchers call it Reward Deficiency Syndrome. Most of us get a steady supply of the brain’s feel-good chemical, dopamine, from ordinary life. A good meal, a laugh with a friend, or a walk in the sun. It doesn’t have to be dramatic to be enough.

Scientists actually call dopamine the “pleasure molecule” and the “anti-stress molecule.” When it’s released, it doesn’t just create feelings of pleasure, it reduces anxiety, quietens negative feelings, and creates a basic sense that everything is okay. It’s less about highs and more about baseline wellbeing.

For some people, that system is wired differently. Research has found that certain people carry a genetic variation that means they have fewer dopamine receptors, or less sensitive ones. The baseline is lower and ordinary life doesn’t quite deliver. There’s a persistent flatness and a sense that something is missing, even when everything looks fine from the outside.

And then they discover alcohol.

Alcohol floods the brain’s reward system in a way that ordinary experience simply can’t match. Research shows it can produce dopamine surges three to five times higher than any natural reward like food, connection, or achievement. For someone whose dopamine system is already running low, that first drink can feel less like a treat and more like a correction. Like finally feeling normal.

This is why “just stop” misses the point so completely. You’re not asking someone to give up a pleasure, you’re asking them to go back to a baseline that felt broken.

Of course, the brain adapts, tolerance builds, and more is needed to get the same effect. And over time, chronic drinking actually reduces dopamine activity, meaning the person ends up with less capacity for natural pleasure than when they started. Withdrawal, when the person tries to stop, isn’t just uncomfortable, it can be medically dangerous. The body has reorganised itself around the substance.

None of this means the person has no agency. But it does mean the battle is being fought on very uneven ground.

Next week we go deeper, beneath the neuroscience and into the psychology. Because the brain tells us how addiction works. It doesn’t fully explain why it started.

 Did you ever suspect there was something biological going on, in yourself or someone you love? I’d be interested to hear.