People who are depressed tend to have lower levels of serotonin and people who are very happy have higher levels.

Name: People who are depressed tend to have lower levels of serotonin and people who are very happy have higher levels.
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Serotonin is a neurotransmitter that is often linked to mood regulation. Lower levels of serotonin are associated with depression, while higher levels are thought to contribute to feelings of happiness and well-being.

People Who Are Depressed Tend to Have Lower Levels of Serotonin