High levels of dopamine and a related hormone, norepinephrine, are released during attraction. These chemicals make us giddy, energetic, and euphoric, even leading to decreased appetite and insomnia – which means you actually can be so “in love” that you can't eat and can't sleep.

Is love proven by science?

Contrary to what we like to say and believe, the feeling of love doesn't occur in our hearts, at least scientifically. Instead, it happens in our brain when we release hormones (oxytocin, dopamine, adrenaline, testosterone, estrogen, and vasopressin) that create a mix of feelings: euphoria, pleasure or bonding.

What does science have to say about love?

Science has identified three basic parts of love, each driven by a unique blend of brain chemicals. Lust is governed by both estrogen and testosterone, in both men and women. ... Long-term attachment is governed by a very different set of hormones and brain chemicals—oxytocin and vasopressin, which encourage bonding.