The Ultimate Guide to the Causes of Brain Fog

  • The Connection Between Adrenal Fatigue and Brain Fog

    Medically Reviewed By Dr. Alexandru-Theodor Amarfei, M.D. Coordinator, Geriatric Medicine – CHIC Unisanté, France Last Updated February 2, 2026 Read Time 12 min Quick Answer: Adrenal fatigue brain fog occurs when chronic stress dysregulates the HPA axis (Hypothalamic-Pituitary-Adrenal axis), causing...

  • Does Lack of Sunlight and Vitamin D Cause Brain Fog?

      Medical Review Dr. Alexandru-Theodor Amarfei, M.D. Coordinator, Geriatric Medicine – CHIC Unisanté Updated February 2, 2026 Reading Time 12 minutes Can vitamin D deficiency cause brain fog? Yes. Research confirms that serum 25-hydroxyvitamin D levels below 20 ng/mL impair...

  • Nicotine Withdrawal and Brain Fog

      Why your brain feels broken—and the neuroscience proving it will heal. Including the exact dopamine recovery timeline, latest research on cognitive symptoms, and evidence-based strategies to clear the fog faster. Medically Reviewed Dr. Alexandru-Theodor Amarfei, M.D. Updated February 2,...

  • Brain Fog from Quitting Caffeine

    Medical Review Dr. Alexandru-Theodor Amarfei, M.D. Geriatric Medicine Coordinator Updated February 2, 2026 Reading Time 9 min Quick Answer Caffeine withdrawal brain fog is a temporary cognitive impairment caused by adenosine receptor upregulation and increased cerebral blood flow. Symptoms typically...

  • Medical illustration of the gut-brain axis, showing toxins from leaky gut rising to cause neuroinflammation and brain fog.

    Brain Fog and Leaky Gut: Permeability Explained

    ✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, France You eat a meal and 30 minutes later, you feel like you've been drugged. You aren't just full; your brain is offline. You have bloating, maybe...

  • Microscopic medical illustration of candida fungal overgrowth (mycelium) attacking healthy neural tissue, visualizing the cause of candida brain fog.

    The Link Between Candida Overgrowth and Brain Fog

    ✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, France You wake up feeling groggy. Throughout the day, you feel clumsy, forgetful, and spaced out—almost like you are hungover. But you haven’t had a drop of...

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