Low levels of serotonin in the blood could predict long COVID symptoms, according to new research. The study traces a possible cause for persistent symptoms like brain fog, memory loss and fatigue all the way from the gut to the brain. 🧠 The amino acid tryptophan plays an essential role in producing serotonin in the gut — where 90% of it is made. 🧠 Lingering viral RNA can cause inflammation in the gastrointestinal tract that hampers tryptophan absorption. 🧠 Low serotonin impairs the vagus nerve, which acts like the brain's monitoring system. Brain activity drops in response, which could cause long COVID symptoms. 🧠 Future studies are needed to fully understand the serotonin pathway's effect on long COVID, as this study was done on mice. |
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