Internal Factors: What's Happening Inside Your Body

💊 Medications

Medications That Can Raise Cortisol:

• Corticosteroids: Prednisone, hydrocortisone, dexamethasone (prescribed for inflammation, autoimmune conditions, asthma). Long-term use can suppress your body's natural cortisol production.
• Estrogen / Birth Control Pills: Can increase cortisol-binding proteins, effectively raising total cortisol levels.
• Some Antidepressants: Particularly in initial weeks of treatment.
• Interferon (Hepatitis C treatment): Can stimulate cortisol production.
• Withdrawal from certain medications: Can cause temporary cortisol surges.

Medications That May Lower Cortisol:

• Long-term Steroid Use: Paradoxically, prolonged corticosteroid use can suppress the adrenal glands' natural cortisol production — the body stops making its own when an external supply is consistently provided.
• Opioids: Chronic use can suppress the HPA axis.
• Some Antifungals: Ketoconazole, fluconazole (in high doses) can inhibit cortisol synthesis.

🍽️ Nutritional Status

This is where nutrition truly shines as a powerful modulator of cortisol function. Your diet doesn't just provide calories — it provides the raw materials for hormone production and the cofactors needed for thousands of biochemical reactions in the HPA axis.

Vitamin C

The adrenal glands contain one of the highest concentrations of vitamin C in the body. Deficiency impairs cortisol production and stress response. Found in: citrus fruits, bell peppers, broccoli, strawberries, kiwi.

B Vitamins (B5, B6, B12)

Essential for adrenal function and cortisol synthesis. B5 (pantothenic acid) is particularly crucial. Found in: whole grains, legumes, leafy greens, nutritional yeast, mushrooms, avocados.

Magnesium

Involved in over 300 enzymatic reactions, including those regulating the stress response. Deficiency is associated with anxiety and elevated cortisol. Found in: pumpkin seeds, almonds, spinach, black beans, dark chocolate.

Omega-3 Fatty Acids

Help regulate the HPA axis and reduce excessive cortisol response to stress. Found in: flaxseeds, chia seeds, walnuts, algae-based supplements.

Zinc

Necessary for proper HPA axis function. Deficiency can increase cortisol response to stress. Found in: pumpkin seeds, chickpeas, lentils, cashews, oats.

Protein & Amino Acids

Adequate protein provides building blocks for neurotransmitters and hormones. Chronic protein deficiency impairs cortisol regulation. Found in: legumes, tofu, tempeh, quinoa, nuts, seeds.

Blood Sugar Regulation: Unstable blood sugar creates a cortisol roller coaster. When blood sugar drops, your body releases cortisol to mobilise glucose stores. Eating refined carbohydrates causes blood sugar spikes followed by crashes, triggering repeated cortisol release. A whole-food, plant-based diet rich in fibre helps stabilise blood sugar and, consequently, cortisol patterns.

🏥 Medical Conditions

• Cushing's Syndrome: Tumours or abnormalities in the pituitary or adrenal glands causing excessive cortisol production.
• Addison's Disease: Autoimmune destruction of the adrenal glands leading to insufficient cortisol.
• Thyroid Disorders: Both hypothyroidism and hyperthyroidism can affect cortisol levels and HPA axis function.
• Diabetes: Particularly poorly controlled diabetes can elevate cortisol and impair cortisol rhythm.
• Chronic Inflammatory Conditions: Conditions like rheumatoid arthritis, inflammatory bowel disease, and chronic infections can dysregulate cortisol.
• Sleep Disorders: Sleep apnea, insomnia, and other sleep disorders disrupt cortisol rhythms.
• PTSD and Chronic Anxiety Disorders: Can cause persistent alterations in HPA axis function.
• Obesity: Particularly visceral (belly) fat is associated with altered cortisol metabolism and can perpetuate high cortisol.

🧬 Genetics

Your genes influence how your body produces, metabolises, and responds to cortisol. Some people are genetically predisposed to stronger cortisol responses to stress, while others have variants that affect cortisol receptor sensitivity. This explains why identical stressors affect people so differently — your genetic makeup is one of the most underappreciated variables in cortisol biology.

🎂 Age

Cortisol regulation changes across the lifespan. Elderly individuals often have higher baseline cortisol levels and less pronounced diurnal variation. This may contribute to some age-related health issues including cognitive decline and metabolic changes. Crucially, the lifestyle strategies that protect cortisol rhythm in younger life appear to help preserve that rhythm as we age — making early investment in cortisol health particularly valuable.

⚧️ Sex Hormones

Estrogen, progesterone, and testosterone all interact with the HPA axis. Women may experience cortisol fluctuations across the menstrual cycle, during pregnancy, and in menopause. Men with low testosterone may have altered cortisol patterns. The interplay between sex hormones and cortisol is complex and bidirectional — elevated cortisol suppresses sex hormone production, and declining sex hormones can make the HPA axis less responsive to feedback.

🦠 Gut Health

The gut-brain axis is a bidirectional communication highway. An unhealthy gut microbiome (dysbiosis) and intestinal permeability ("leaky gut") can activate the immune system and stress response, chronically elevating cortisol. Conversely, chronic stress and high cortisol can damage the gut lining and alter the microbiome. Probiotic-rich foods (fermented vegetables, non-dairy yoghurts) and prebiotic fibres support a healthy microbiome and, through the gut-brain axis, healthier cortisol regulation.