The Ultimate Guide to the Causes of Brain Fog

  • 3D medical illustration showing a blood sugar spike followed by a hypoglycemic crash, explaining the biological mechanism of brain fog after eating.

    Brain Fog After Eating: What's the Connection?

    ✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, France It’s 1:30 PM. You just finished lunch. You should feel energized, but instead, you feel like you've been sedated. Your eyes are heavy, your focus is...

  • Surreal illustration of a translucent marble head with a glowing red ember inside, representing the burning sensation and cognitive clouding caused by chronic neuroinflammation.

    Chronic Inflammation: The Hidden Fire Clouding Your Mind

    ✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, FranceYou feel it behind your eyes—a heavy, pressurized sensation. You aren't tired, but you can't think. You struggle to find words. You feel disconnected, like you're watching...

  • Surreal illustration of a prescription bottle releasing a cloud of gray fog shaped like a human brain, symbolizing the cognitive side effects and brain fog caused by certain medications.

    10 Common Medications That Can Cause Brain Fog

    ✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, France You visit the doctor to fix a symptom—allergies, heartburn, or anxiety. The medication works. But weeks later, you notice something else: names are harder to recall....

  •  the best foods to fight brain fog.

    Nutrient deficiencies brain fog

    The 5 Vitamin Deficiencies That Cause Brain Fog Brain fog caused by vitamin deficiency is most commonly linked to low levels of Vitamin B12, Iron, Vitamin D, Magnesium, and Omega-3 fatty acids. These five nutrients are essential for nerve signaling,...

  • 3D medical illustration showing the Vagus nerve connecting the brainstem to the intestines, demonstrating the bidirectional communication of the gut-brain axis.

    Constant Mental Fatigue? How the Gut-Brain Axis Triggers Brain Fog

    name="keywords" content="constant mental fatigue, brain fog, gut-brain axis, leaky gut syndrome, cognitive dysfunction, mental clarity, neuroinflammation">   Published: January 14, 2026 ~28 min read DA Dr. Alexandru-Theodor Amarfei, M.D. Coordinator, Geriatric Medicine – CHIC Unisanté, France Specialist in age-related cognitive...

  • Conceptual illustration of a human silhouette filled with chaotic static, representing the internal mental noise of high cortisol and stress-induced brain fog.

    How Chronic Stress and Cortisol Cause Brain Fog

    📅 Updated: January 23rd 2026 ⏱️ 18 min read ✅ Medically Reviewed by Dr. Alexandru Amarfei, M.D. Stress cortisol brain fog causes 30% synaptic loss in your prefrontal cortex and shrinks your hippocampus by up to 14%. This isn't burnout—it's...