ENDORPHINS SERVE ONE purpose and one purpose only: to mask physical pain. That’s it. Think of endorphins as our own personal opiate. Often released in response to stress or fear, they mask physical pain with pleasure.

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It is dopamine that makes us a goal-oriented species with a bias for progress.

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As we get closer to our goals, the metrics tell us we’re making progress and we get another little hit to keep us going. Then finally, when we reach our goal, that intense feeling of “got it” is a big hit of dopamine, our biological reward for all that hard work.

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Obviously the bigger the goal, the more effort it requires, the more dopamine we get. This is why it feels really good to work hard to accomplish something difficult, while doing something quick and easy may only give us a little hit if anything at all.

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Cocaine, nicotine, alcohol and gambling all release dopamine.

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There is another thing to add to that list of things that can hijack our dopamine reward system: social media.

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Serotonin is the feeling of pride. It is the feeling we get when we perceive that others like or respect us. It makes us feel strong and confident, like we can take on anything.

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Serotonin is the feeling of pride. It is the feeling we get when we perceive that others like or respect us. It makes us feel strong and confident, like we can take on anything. And more than confidence boosting, it raises our status.

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Those who work hardest to help others succeed will be seen by the group as the leader or the “alpha” of the group. And being the alpha—the strong, supportive one of the group, the one willing to sacrifice time and energy so that others may gain—is a prerequisite for leadership.

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OXYTOCIN IS MOST people’s favorite chemical. It’s the feeling of friendship, love or deep trust.

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definition of love is giving someone the power to destroy us and trusting they won’t use it.

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This is the power of oxytocin. It actually makes us good people.

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This is the power of oxytocin. It actually makes us good people. The more good

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This is the power of oxytocin. It actually makes us good people. The more good things we do, the more good we want to do.

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It is also part of the reinforcing bond between athletes, for example, when they high-five, fist-bump or smack each other. It reinforces the bond they share and the commitment they have to work together for their common goal.

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Oxytocin really is magical stuff. Not only is it behind the feelings of trust and loyalty, it also makes us feel good and inspires us to do nice things for others.

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Oxytocin boosts our immune systems, makes us better problem solvers and makes us more resistant to the addictive qualities of dopamine.

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cortisol is designed to alert us to possible danger and prepare us to take extra measures to protect ourselves to raise our chances of survival.

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Cortisol is not supposed to stay in our systems; it is supposed to fire off when we sense a threat and then leave when the threat has passed. And for good reason. The stress on our bodies is serious.

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The paranoia cortisol creates is just doing its job. It is trying to get us to find the threat and prepare for it. Fight, run or hide.

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