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- ✍️DraftedThursday, September 10, 2026 at 6:35 PM
- ✓Approved by clientSaturday, September 12, 2026 at 5:06 PM
- 📡Published to platformSunday, September 20, 2026 at 1:10 PM
You've been told to fix your gut to fix your mood
Ninety five percent of your serotonin is made in your gut. That part is true. It is the sentence that always comes next that I want to talk about. Your gut really does build almost all of it, in the lining, out of an amino acid you get from food. Genuine. But it never reaches your brain. Your brain does not let circulating serotonin in. The serotonin in your head is made in your head, by different cells, from a different starting point. Two systems, one name, and they do not pool. So what is all that gut serotonin doing? Running your plumbing. It drives the muscle waves that move food through you. Real job. Important job. Not a feelings job. Here is the genuinely interesting part. Tryptophan does cross into your brain, but it rides a transporter it has to share with several other amino acids and they compete for the same doorway. Which is why the turkey story is backwards. A big protein dinner crowds that queue and actually lowers the tryptophan getting through. The sleepiness is the size of the meal, not the bird. And where we honestly are: most of the dramatic gut and mood findings come from mice raised with no gut bacteria at all, and carrying that across to people has not worked yet. I am not saying that to be discouraging. I am saying it because "fix your gut, fix your mood" is being sold hard right now and it is not standing on what people think it is standing on. Eat well because it is good for you and because you deserve to feel looked after. Not because it is going to fix how you feel. If you are genuinely struggling, that is a conversation with a real person who can help.
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