Cortisol and Mental Health: Understanding the Stress Hormone
Disclaimer: This article is for educational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult your qualified healthcare provider before making changes to your diet, supplements, or treatment plan.
Cortisol is often referred to as the body’s “stress hormone,” but this description only captures part of its role in human health. Cortisol is a vital hormone produced by the adrenal glands that helps regulate metabolism, immune function, blood sugar, inflammation, and the body’s response to stress. In healthy physiology, cortisol follows a circadian rhythm—rising in the morning to help us wake up and gradually declining throughout the day.
However, when stress becomes chronic, cortisol regulation can become dysregulated. Persistent elevations in cortisol are associated with anxiety, depression, metabolic dysfunction, sleep disruption, and neuroinflammation. Research increasingly shows that chronic stress and dysregulation of the stress-response system can contribute to both psychiatric and physical health conditions.
Understanding cortisol is important because this hormone sits at the intersection of mental health, nutrition, inflammation, and lifestyle factors.
The HPA Axis: The Brain-Stress-Hormone Connection
Cortisol is regulated by the hypothalamic–pituitary–adrenal (HPA) axis, one of the body’s key neuroendocrine stress systems. When the brain perceives stress:
The hypothalamus releases corticotropin-releasing hormone (CRH)
The pituitary gland releases adrenocorticotropic hormone (ACTH)
The adrenal glands produce cortisol
This cascade mobilizes energy, increases glucose availability, and prepares the body for a “fight-or-flight” response.
In the short term, this response is adaptive. However, chronic activation of the HPA axis can lead to persistent cortisol elevation, which contributes to inflammation, mood disorders, cognitive impairment, and metabolic disease. Dysregulation of the HPA axis has been observed in a number of psychiatric conditions, including depression, anxiety disorders, and trauma-related disorders.
Cortisol and Mental Health
Cortisol dysregulation is increasingly recognized as an important factor in mental health conditions.
Research suggests:
Major depressive disorder is often associated with hyperactivity of the HPA axis.
Chronic stress and elevated cortisol contribute to neuroinflammation and may affect brain regions involved in mood regulation, such as the hippocampus and prefrontal cortex.
Anxiety disorders may involve altered cortisol responses to stress.
Elevated cortisol can also interfere with sleep, worsen fatigue, impair concentration, and increase emotional reactivity.
Addressing cortisol dysregulation often involves looking at both biological and lifestyle contributors to chronic stress.
The Food-Mood-Cortisol Connection
Emerging research in nutritional psychiatry highlights the relationship between diet and mental health. As explored in This Is Your Brain on Food and other nutritional psychiatry literature, the foods we eat influence neurotransmitter production, inflammation, gut health, and stress hormones.
Nutrition influences cortisol regulation through several mechanisms.
Inflammation
Highly processed diets high in refined carbohydrates, trans fats, and added sugars increase systemic inflammation. Chronic inflammation can activate the HPA axis and contribute to persistent stress signaling in the body.
Blood Sugar Stability
Blood sugar fluctuations are a common but often overlooked trigger for cortisol release. When blood glucose drops too low, the body releases cortisol and other stress hormones to raise glucose levels. Frequent spikes and crashes from highly processed foods may therefore contribute to chronic stress physiology.
The Gut–Brain Axis
The gut microbiome communicates directly with the brain through immune, neural, and endocrine pathways. Emerging research suggests that gut bacteria may influence stress resilience and HPA-axis regulation.
Nutrient Deficiencies
Deficiencies in nutrients such as magnesium, B vitamins, and omega-3 fatty acids may impair the body’s ability to regulate stress and inflammation.
Dietary patterns rich in whole foods-such as vegetables, fruits, healthy fats, lean proteins, and fiber-may help support healthier cortisol regulation and overall mental wellbeing.
Nutritional and Herbal Strategies to Support Healthy Cortisol Levels
While no single food or supplement can eliminate stress, certain nutrients and herbs may help support the body’s stress-response systems.
Magnesium-Rich Foods
Magnesium plays a role in nervous system regulation and stress resilience.
Sources include:
Leafy greens
Avocados
Nuts and seeds
Dark chocolate
Magnesium deficiency has been associated with increased stress sensitivity and poor sleep.
Omega-3 Fatty Acids
Omega-3 fatty acids have anti-inflammatory properties and may support mood regulation and stress resilience.
Sources include:
Fatty fish such as salmon and sardines
Walnuts
Flax seeds
Chia seeds
Omega-3 intake has been linked to improved emotional regulation and reduced inflammatory signaling.
Antioxidant-Rich Foods
Oxidative stress contributes to inflammation and may worsen stress-related conditions.
Examples include:
Berries
Colorful vegetables
Green tea
Herbs and spices such as turmeric and ginger
Ashwagandha: An Adaptogenic Herb for Stress Support
Ashwagandha (Withania somnifera) is an herb traditionally used in Ayurvedic medicine and increasingly studied for its potential effects on stress and cortisol regulation.
Ashwagandha is classified as an adaptogen, meaning it may help the body adapt to physical and psychological stress. Adaptogens are thought to support the HPA axis, the neuroendocrine system responsible for regulating cortisol.
Clinical research has shown that ashwagandha supplementation may:
Reduce perceived stress and anxiety
Lower serum cortisol levels
Improve sleep quality
Enhance overall stress resilience
The proposed mechanisms include modulation of the HPA axis, antioxidant effects, anti-inflammatory activity, and potential effects on neurotransmitter systems involved in mood regulation.
While ashwagandha may be helpful for some individuals, it is not appropriate for everyone. It may interact with certain medications, including thyroid medications and sedatives, and should be used cautiously in pregnancy. Herbal supplements should ideally be used under the guidance of a qualified healthcare professional.
Lifestyle Factors That Influence Cortisol
Nutrition is only one component of cortisol regulation. Several lifestyle factors also play critical roles.
Sleep
Healthy cortisol rhythms depend on consistent sleep patterns. Chronic sleep deprivation can disrupt circadian rhythms and increase cortisol levels.
Stress-Management Practices
Mindfulness, meditation, breathing exercises, and yoga have been shown to reduce physiological stress responses and improve emotional regulation.
Physical Activity
Moderate, regular exercise supports healthy stress regulation and improves mood. However, excessive high-intensity exercise without adequate recovery can increase cortisol levels.
Social Connection
Positive relationships and social support can buffer the physiological effects of stress and support mental wellbeing.
The Bottom Line
Cortisol plays a crucial role in the body’s ability to respond to stress and maintain balance. However, chronic stress, poor sleep, and modern dietary patterns can disrupt this delicate system.
Supporting healthy cortisol rhythms often involves a combination of nutrition, lifestyle strategies, stress management, and appropriate medical care.
When cortisol levels are balanced, the body is better able to maintain emotional stability, resilience to stress, and overall mental wellbeing.
References
Naidoo, U. (2020). This Is Your Brain on Food. Little, Brown Spark.
Knezevic, E., et al. (2023). Cortisol and chronic stress: mechanisms and implications for mental health. Cells.
Lopresti, A. L., Smith, S. J., Malvi, H., & Kodgule, R. (2019). An investigation into the stress-relieving and pharmacological actions of an ashwagandha extract. Medicine, 98(37), e17186.
Stachowicz, M., & Lebiedzińska, A. (2016). The effect of diet components on cortisol levels. European Food Research and Technology.
