We all know how it feels when you see someone across the room.

當你看見某人時，我們都很清楚知道是什麼感覺。

Your eyes meet and everything slows down for a minute.

你們的眼神交會，周邊的事物都慢下來一分鐘。

Your medial prefrontal cortex plays a big role in your initial attraction to someone.

當你喜歡某個人，你的內側前額葉皮質質扮演了重要的角色。

And it judges physical attractiveness in just a milliseconds.

它會在一毫秒內判斷外在的吸引力。

Does your heart flutter when you see your crush?

當你看到喜歡的人時，心裡小鹿亂撞嗎？

The adrenal gland causes the hormones adrenaline, epinephrine and norepinephrine, to be pumped through your blood.

這是因為腎上腺導致荷爾蒙腎上腺素、腎上腺素、正腎上腺素流經你的血液。

In turn, your heart beats more quickly.

接著，你的心跳加快。

Or maybe you get butterflies in your stomach.

或你會緊張到胃像是在翻動一樣。

This happens when adrenaline is sent to your lungs, muscles, and brain.

會如此是因為腎上腺素被送到你的肺、肌肉和大腦中。

This also directs blood flow to those areas, with not a lot of blood left for your stomach.

這也直接導致血液流經這些區域，所以在胃裡的血液就沒那麼多了。

Dopamine is also the reason you feel so good.

另一個讓你心情好的原因是多巴胺。

Tests show that love has a similar effect on dopamine levels as taking drugs, such as cocaine.

實驗顯示，愛和嗑藥有相似的效果，有差不多的多巴胺濃度，例如嗑古柯鹼。

Sometimes, we get obsessed or fixated on our new love.

有時，我們深深著迷於我們的新歡。

Couples who have recently fallen in love have significantly lower levels of serotonin.

陷入熱戀的情侶，血液中的血清素濃度會明顯下降。

This is also experienced by people with Obsessive Compulsive Disorder, which may explain why you can't stop thinking about your new boo.

這跟強迫症患者的情況相同，這也說明了為什麼你會不斷的想著你的另一半。

Falling in love can be stressful, though.

然而，談戀愛也是很有壓力的。

Cortisol, a stress hormone, is higher in people who have recently fallen in love.

皮質醇，一種壓力賀爾蒙，人一旦陷入熱戀時它就會增加。

But overtime, kissing your loved one will lower your cortisol levels.

但一段時間後，親吻你的愛人會降低你的皮質醇。

One study even found, that being married will lengthen a man's life by seven years and a woman's by two years.

甚至有研究指出，結婚可以延長男人七年的壽命，女人則能延長兩年的壽命。