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In Habits of a Happy Brain, Loretta Graziano Breuning explains that our feelings of well-being are driven by four primary neurochemicals inherited from our mammalian ancestors: dopamine, endorphin, oxytocin, and serotonin. These chemicals evolved to reward behaviors that promote biological survival, such as finding rewards, ignoring pain, building social trust, and gaining status. Because these "happy chemicals" are released in short bursts and quickly metabolized, the brain naturally returns to a state of cortisol-driven alertness, often leading to a cycle of seeking more stimulation. The text argues that we can rewire our neural pathways by consciously repeating new, healthy behaviors for forty-five days. By understanding how the limbic system and cortex interact, individuals can transition from accidental or "vicious" habits to intentional routines that boost happiness. Ultimately, the book provides a biological framework for managing personal neurochemistry to achieve a more balanced and fulfilling life.