Why being low on iron can make your brain feel foggy
The Impact of Iron Deficiency Anemia on Cerebrovascular Physiology, Brain Structure, and Cognitive Function in Otherwise Healthy Women
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When women have very low iron, their brains don’t get enough oxygen, and they don’t pump more blood to fix it—unlike most people with anemia. This makes their brains shrink a little and they have trouble remembering and thinking clearly.
Systematic Reviews & Meta-Analyses
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Evidence Score
A snapshot of a population at a single point in time. Can identify correlations and prevalence, but cannot determine the direction of cause and effect.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When women have very low iron, their brains don’t get enough oxygen, and they don’t pump more blood to fix it—unlike most people with anemia. This makes their brains shrink a little and they have trouble remembering and thinking clearly.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 543 / 44
Evidence Score
A snapshot of a population at a single point in time. Can identify correlations and prevalence, but cannot determine the direction of cause and effect.
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Claims (6)
Iron is a critical component in the blood that enables oxygen to be carried from the lungs to muscles and the brain.
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 cognitive difficulties are.
When people have severe iron deficiency anemia, their brains do not increase blood flow as much as expected compared to people with other forms of long-term anemia. This suggests that iron deficiency affects brain blood flow in a unique way that is not just due to low oxygen levels.
Women with low hemoglobin due to iron deficiency anemia show measurable reductions in cognitive abilities such as verbal learning, memory, and decision-making, compared to those without this condition.
In women, low iron levels without anemia might be the main cause of problems with thinking and blood vessel function in the brain, based on observations that brain changes do not always match hemoglobin levels.