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13 Things That Happen When You Fall In Love, According To Science

Spoiler: It's mostly just chemicals.

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1. You get all flustered when you're around them, your heart beats faster and your hands get all clammy.

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Levels of the hormone adrenaline go up when you're around someone you fancy, leading to a whole host of really attractive reactions from your body.

2. Your thoughts about them border on obsessive.

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When you fall in love, levels of the hormone serotonin (which has a calming affect) appear to drop. Serotonin levels also drop in people with Obsessive Compulsive Disorder, which might explain just why you can't stop thinking about your crush.

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4. Your cortisol levels go up when you're falling in love.

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Also known as hydrocortisone, cortisol is a hormone that is released in reponse to stress. Not exactly surprising, as it can be a very stressful time.

5. In women, testosterone goes up, but in men it goes down.

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This kind of evens things out. "It's as if nature wants to eliminate what can be different in men and women, because it's more important to survive [and mate] at this stage," researcher Donatella Marazziti told New Scientist.

6. If you're lucky, they like you too.

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That's most likely if they have genes that are different to yours, according to one experiment in which women smelled men's tshirts. They overwhelmingly prefered those tshirts belonging to men with different immune system genes from their own.

7. You can also expect euphoria, sleeplessness, loss of appetite, and a rush of motivation.

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You can say thanks to neurotransmitter dopamine for that. Dopamine is also what is responsible for making love feel addictive (among the many, many other things it does).

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