Research has shown that a simple act of kindness directed toward another improves the functioning of the immune system and stimulates the production of serotonin in both the recipient of the kindness and the person extending the kindness. Kindness extended, received or observed beneficially impacts the physical health and feelings of everyone involved.
Cocoa boosts brain serotonin. Almost every single antidepressant aims at either enhancing serotonin or keeping it in the brain longer. Chocolate or cocoa does that very well.
There are a few things that deal with passion. There's Prozac.
Food is a lot of people's therapy - when we say comfort food, we really mean that. It's releasing dopamine and serotonin in your brain that makes you feel good.
Singing and dancing have been shown to modulate brain chemistry, specifically levels of dopamine, the 'feel good' neurotransmitter.
Sugar and chocolate, anything that boosts your serotonin levels, is something people, I think, crave.
Putting good energy into your body and raising your serotonin will lead to a positive mood, exuding a more attractive glow.
Chemically, if you are not happy, your body will not look or be happy.
It's a long way from not having enough serotonin to thinking the world is "stale, flat and unprofitable"; even further to writing a play about a man driven by that thought.
