“Dopamine increases our feelings of happiness. Serotonin release is associated with reduced stress. Low levels of serotonin are associated with depression and aggression.”
Also, Dr. Murray Grossan points to the science of psychoneuroimmunology (the study of how the brain is connected to the immune system) that
"Depression weakens your immune system, while happiness, on the other hand, has been shown to boost our body’s resistance."
When you smile, the brain sees the muscle activity and assumes that humour is happening. When you smile your immune system gets better, your mood lifts up and your stress and anxiety levels go down. Send Smiles.
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