| Mood. Sleep. Cravings. They are all connected.
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| And the connection is serotonin.
Most people think of serotonin as a 'happiness chemical.' That framing undersells it enormously. Serotonin plays a role in how well you sleep, how stable your mood feels throughout the day, how your appetite is regulated, and even how you process anxiety.
Here is the part that surprises most people: roughly 90% of your serotonin is produced in your gut, not your brain. And after 40, the precursors your body needs to produce it efficiently start to decline.
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