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Your heart beats faster. You can hear your blood pulsing in your veins. Every time he even looks at you, you feel a burst of energy. Could it be? Are you in love?  Our bodies send us signals that tell us “this guy could be a keeper” it’s no big surprise.  But how does this work exactly? Is it something we do subconsciously? Do our brains and bodies really tell us when we’re in love? We asked a couple of scientists to sound in on five physical signs you’re in love.

You catch yourself staring, Dr. Brown, neuroscientist and professor at the Albert Einstein College of Medicine, who has studied neural basis of emotion, says the eyes are what matters most. When you’re in love, you involuntarily cannot keep your eyes off of the object of your affection. Humans naturally find eye contact rewarding. Not only that, but we’re physically compelled to pursue eye contact with our romantic interests.

“One of the involuntary manifestations of being in love is ‘mooning around’ the person, having your eyes constantly fixed on a person,” she says.

You feel high, when you realize you’ve been hyperactively talking about your new beau, you might think you’ve had too much caffeine. It’s actually a different drug. “Being in love is like being high on cocaine,” according to Dr. Brown.  Many of the physical symptoms are the same: increased energy, increased heart rate and blood pressure (especially when you see the person), and the inability to sleep or eat. Feelings of euphoria also appear with cocaine use, as they do when in love.  These symptoms occur because, while the brain produces dopamine on its own, it produces even more when in love. The brain also produces more of the chemical norepinephrine when we’re in love, speeding up the heart when we’re nervous, as we might be upon seeing our beloved.

Some psychologists actually regard love as an addiction instead of an emotion because it causes these aforementioned behaviors and because it is a “goal-oriented motivational state” like addiction. Love also activates the subcortical and cortical areas of the brain associated with drug cravings.

You can’t keep your hands off each other.  You won’t just be seeking your beau visually. this explains why grade-school flirtation often involves pushing or hair-pulling. When in love, we can’t resist the urge to touch our beloved.  Dr. Bianca Acevedo, visiting scientist at the State University of New York at Stony Brook, says that when we’re in love, our bodies will subconsciously lean toward each other a physical manifestation of the brain’s desire for emotional closeness.

You can’t stop thinking about them.  With the increased dopamine levels of romantic love, people think about their romantic interests, on average, 85 percent of the day. This is known as “intrusive thinking.”  According to Dr. Brown, “In the early stages of romantic love, most people can’t stop thinking about their beloved.  The other person becomes an obsession.” And will occupy their thoughts for what may seem like an extreme amount of time.  But it’s really quite normal.  In fact, “If it is less than 40 percent, then it is not really intense romantic love.”  The level of obsession, while normal if in love, is often compared to that of obsessive-compulsive disorder. When patients undergo treatment for OCD, they’re provided with serotonin reuptake inhibitors to ease their obsessions.  Because of this, scientists figure that the decrease in the brain’s normal serotonin levels causes similar behaviors when in love.

You have strong feelings only for them.  According to Dr. Brown, when we seek a mate with romantic love in mind, we’d prefer a long-lasting relationship. This means we have strong feelings of romantic love for just one person.  While people won’t die without love, as they would without food or water, Dr. Brown says studies have shown that people in relationships live longer; they’re also usually healthier.

However, the kind of love we seek depends very much on our hormonal status, what our bodies need at a certain moment in time. But remember, it doesn’t last forever. Unfortunately, the heightened emotions and general euphoria brought on by romantic love eventually fades.

As feelings of intense romantic love wane, feelings of attachment develop and that’s what keeps people together for the long run.  “You can have just ‘attachment’ but it’s better for the couple if there’s romantic love at the start. People stay together because they remember the warm, positive feelings of having that original, romantic love.”

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