There are tons of clichés to describe the feeling of falling in love, from butterflies in your stomach to your heart racing to the cover of a Harlequin romance novel.
As cheesy as they may sound, they’re accurate in that our bodies do physically change when we’re in love. These biological changes are more than intangible tingles. So, for the sake of science, we’re disbanding the poetic love clichés and giving you the skinny on the science behind love.
MRIs show that the caudate nucleus and ventral tegmental area of your brain lights up when you’re in the romantic phase of love. This is thanks to the release of the “love chemical” dopamine (we know it as the addictive substance that sugar, sleep, thirst and tobacco trigger).
When you’re in love and nurture the relationship, your brain pumps out this feel-good chemical. This in turn drives reward-seeking behavior (craving), increasing the brain’s release of the euphoric hormone, serotonin.
The result? The better you feel, the more you want. Because the dopamine pathway increases with risk taking, we tend to seek what’s new and exciting.
When in “romantic” love, dopamine and serotonin are high. Without your loved one, that lovesick feeling is no joke, it’s chemical! (This is the stuff love poems are made of.) Being lovesick makes serotonin levels drop 40 percent—to the level of people with obsessive-compulsive disorder. And being in love triggers the release of “happy chemicals,” explaining why we feel happy when we’re in a good relationship.
Unfortunately, we all develop a tolerance to dopamine over time. Our brain cells release the same amount, but the receptors turn inward; they don’t get the dopamine message. This is why relationships can lose some luster over the years.
One way to continue the chemical high is to try new (and exotic) behaviors to increase dopamine. This stimulates more receptors (the reason why new sex positions and sex in different rooms seem exciting).
Don’t worry, another hormone comes into play to keep you engaged in a loving relationship. Oxytocin is the powerful chemical that makes you feel intimacy and a sense of community. When researchers blocked oxytocin in prairie voles (animals that mate for life), they came out of their holes and moved on. No oxytocin, no intimacy, no lifelong love. Talking also increases oxytocin. Perhaps this explains why communication is so important in relationships.
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