Which neurotransmitter is primarily involved in mood regulation, appetite, and sleep patterns?

Serotonin is a key neurotransmitter that plays a crucial role in regulating mood, appetite, and sleep patterns. It is often referred to as a "feel-good" neurotransmitter because it contributes significantly to feelings of well-being and happiness. Low levels of serotonin are commonly associated with mood disorders such as depression and anxiety, highlighting its importance in emotional regulation.

In addition to influencing mood, serotonin also helps control appetite and can affect sleep by regulating the body's sleep-wake cycles. It is synthesized from the amino acid tryptophan and is primarily found in the brain, intestines, and blood platelets. The versatility of serotonin's functions in both mental health and physiological processes makes it a vital neurotransmitter in overall well-being.