Love is arguably the most written-about, sung-about, and argued-about subject in human history — yet it remains one of the hardest things to define. Is it a feeling? A choice? A chemical reaction? The answer, it turns out, is all three.
The Neuroscience of Love
When you fall in love, your brain lights up like a Christmas tree. Dopamine floods the reward pathways, creating the euphoric, can't-eat-can't-sleep sensation we associate with new romance. Oxytocin — nicknamed the "bonding hormone" — surges with physical touch and creates feelings of closeness and trust. Meanwhile, serotonin levels actually drop, which researchers believe explains why new lovers can't stop thinking about each other.
The brain in love looks remarkably similar to the brain on cocaine. That's not a metaphor — the same reward circuits activate. This is why heartbreak can feel like withdrawal, and why "love addiction" is a concept taken seriously by psychologists.
Three Stages of Love
Psychologist Helen Fisher identifies three distinct phases:
Lust — driven by testosterone and estrogen, this is the initial physical attraction and desire for a partner.
Attraction — this is the "falling in love" phase dominated by dopamine and norepinephrine. You feel energised, focused on your partner, and experience reduced need for sleep and food.
Attachment — the long-term bonding phase driven by oxytocin and vasopressin. This is where deep companionship, commitment, and lasting love live.
Is Love a Choice?
While the early stages of love feel involuntary, long-term love involves consistent, conscious choices — choosing your partner every day, choosing to communicate, choosing to grow together. Psychologist Robert Sternberg's Triangular Theory of Love proposes that complete love (he calls it "consummate love") combines intimacy, passion, and commitment equally.
What Does This Mean for You?
Understanding love's biology doesn't make it less magical — it makes it more interesting. Knowing that attachment deepens with oxytocin can remind you to prioritise physical closeness with your partner. Knowing that dopamine fades helps explain why the "spark" changes over time (it doesn't disappear — it transforms).
Love is real, love is complex, and love is absolutely worth pursuing.