In women with severe iron deficiency anemia, brain imaging shows lower volumes of grey and white matter in specific regions, and the extent of these structural changes is linked to how severe their...
Mechanism
Synthesis from 1 study
Without enough iron, the blood can't carry sufficient oxygen to the brain. The brain doesn't get enough extra blood flow to make up for it, so over time, parts of the brain that need lots of energy start to shrink. The more they shrink, the worse memory and thinking become.
Most probable mechanism
When the body doesn't have enough iron, it can't make enough hemoglobin to carry oxygen in the blood. This means the brain gets less oxygen than it needs. The brain tries to compensate by increasing blood flow, but it doesn't increase enough to make up for the low oxygen. Over time, the lack of oxygen causes brain tissue in areas that need a lot of energy — like those involved in memory and coordination — to shrink. The more the tissue shrinks, the worse thinking and memory become.
Iron deficiency reduces heme synthesis, leading to decreased hemoglobin production and hypochromic microcytic anemia
Reduced hemoglobin lowers arterial oxygen content, triggering an inadequate compensatory increase in cerebral blood flow
Inadequate cerebral blood flow response results in chronic cerebral hypoxia and reduced metabolic activity in brain tissue
Chronic hypoxia induces structural atrophy in oxygen-sensitive grey and white matter regions, including the right temporal lobe, right cingulate gyrus, corpus callosum, and cerebellum
Atrophy in these regions disrupts neural connectivity and processing efficiency, leading to measurable cognitive impairment across multiple domains
Evidence from Studies
Supporting (1)
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