Can a dopamine detox reset your brain?

Although taking a break from any harmful habit is a good idea, the idea of “dopamine hits” is most associated with social media.

NO SOCIAL MEDIA. No gambling, alcohol or junk food. Certainly no pornography or masturbation. Sounds dull? Welcome to your dopamine detox. Popular among Silicon Valley types, the idea is to abstain from quick-hit rewards in the hope of rediscovering simpler pleasures.

Many are in the habit of turning to social media for a quick dopamine boost. (Shutterstock)

The claim is that all these vices overstimulate the brain’s dopamine system, causing it to become “less responsive” and leaving people disillusioned and burnt out. A few weeks of abstinence, enthusiasts claim, can “reset” the brain.

Taking a purifying break from bad habits is not a new concept—think of Lent sacrifices or Dry January. A dopamine detox is the same idea repackaged with a (pseudo-)scientific twist. Where it goes wrong is the biochemistry. Proponents imagine that dopamine is the “pleasure molecule”; a finite resource that can be exhausted by overuse.

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That is not how dopamine works. It is involved not just in reward, but also in learning and movement. Fully “detoxing” from it would be disastrous. Parkinson’s disease, for example, is caused by the loss of dopamine-producing neurons. Even the chemical’s role in the brain’s reward circuitry is widely misunderstood. “Dopamine is clearly not the pleasure molecule,” says Christian Lüscher, a neuroscientist at the University of Geneva.

Instead, bursts of it signal surprise—what scientists call a reward-prediction error. When something turns out better than expected, dopamine-producing neurons fire more often than usual (when it turns out worse, they fire less). These spikes are teaching signals, strengthening connections between neurons and helping the brain learn which actions are worth repeating. A similar process, known as reinforcement learning, is used to train many modern artificial-intelligence models.

Eventually behaviours that used to be deliberate, such as selecting an app to message a friend, can become automatic: opening it absent-mindedly every time your phone lights up. Habits can be useful. They save the brain from having to think things through from first principles every time. But they can also be traps. Once a behaviour has become habitual, it can persist even when the outcome itself provides no pleasure.

Although taking a break from any harmful habit is a good idea, the idea of “dopamine hits” is most associated with social media. In many ways, apps are designed to be habit-forming, says Georgia Turner, a neuroscientist at Cambridge University, with algorithmic feeds providing a steady flow of low-effort, unpredictable rewards. The dopamine-fasters are right that pausing your use can interrupt this loop—though that happens through normal brain plasticity, not by replenishing dopamine.

Several studies have tested what happens when people take time away from social media. Most find that brief breaks do little for wellbeing, perhaps because there are short-term costs to being disconnected from social networks. When entire social groups ditch the apps for longer, results seem better. In one school-wide experiment in Britain, conducted by researchers from University of York, students avoided social media for three weeks and, afterwards, reported better sleep and mood.

If bad habits can be broken, people have more time for things they truly enjoy. A dopamine detox, in other words, may well be worth trying—even if the mechanism by which it supposedly works is muddled.

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