17/12/2025
🌿 Serotonin: More Than a “Feel-Good” Chemical 🌿
Serotonin plays a vital role in mood, sleep, digestion, motivation, and nervous system balance. While it’s often simplified as the “happy hormone,” serotonin is actually a complex signalling molecule influenced by nutrition, gut health, stress, inflammation, hormones, and genetics. 🧬
When serotonin pathways are disrupted, both mental and physical symptoms can appear.
⚠️ What can interfere with healthy serotonin balance?
🍽️ Nutrition & gut health
Serotonin is made from tryptophan, an amino acid found in protein-rich foods.
Poor dietary intake, restrictive eating, or an imbalanced gut microbiome can reduce serotonin synthesis, as most serotonin is produced in the gut.
🦠 Digestive dysfunction
Gut infections, chronic GI conditions, surgery, or ongoing inflammation can impair serotonin production and signalling, reinforcing the gut–brain loop.
😰 Chronic stress & unresolved trauma
Long-term stress elevates cortisol, which can suppress serotonin activity over time, contributing to anxiety, low mood, poor sleep, and emotional dysregulation.
🌞 Low sunlight & limited movement
Sunlight exposure and regular physical activity both stimulate serotonin pathways.
Reduced exposure (especially in winter) may contribute to fatigue, low mood, or seasonal changes in mental health.
💊 Certain medications
Some medications can alter serotonin production, metabolism, or receptor activity. Effects vary widely and depend on the individual and overall biochemical context.
🧬 Genetic influences
Variants in genes involved in serotonin transport and metabolism (such as SLC6A4) can affect how serotonin is produced, recycled, or utilised, influencing stress sensitivity and mood regulation.
🔥 Inflammation & immune activation
Chronic inflammation, particularly in the gut, can divert tryptophan away from serotonin production and inflammatory pathways (such as the kynurenine pathway), reducing serotonin availability.
💡 Hormonal shifts
Hormonal changes (e.g. pregnancy, menopause, thyroid imbalance) can significantly influence serotonin synthesis and receptor sensitivity.
✨ The key takeaway
Supporting serotonin isn’t about boosting one chemical. It’s about supporting the whole system:
🥗 Nutrient sufficiency
🦠 Gut health
🌿 Inflammation balance
☀️ Light & movement
🧠 Stress regulation
🧬 Genetic context
Small, targeted changes can have a meaningful impact on mood and resilience.
💬 Curious how serotonin, gut health, inflammation, or genetics may be affecting you?
Drop your questions below, we’re here to help.