Iron

topic

Iron is an essential mineral serving as the core component of hemoglobin (oxygen transport in red blood cells) and myoglobin (oxygen storage in muscle), a cofactor for oxidative phosphorylation (cellular energy production), and a required component of numerous enzymes involved in DNA synthesis and neurotransmitter production. Iron deficiency anemia is the most prevalent nutritional deficiency globally, affecting approximately 2 billion people, with women, vegetarians, and endurance athletes at highest risk from inadequate intake, poor absorption (particularly of non-heme plant iron), or excessive losses.

Role

Iron deficiency is the most consequential nutritional gap in the world — and the most systematically missed in clinical settings in its pre-anemia phase, when iron stores are depleted but red blood cell counts remain normal. The pre-anemic iron depletion phase impairs cognitive function, energy metabolism, immune response, thermoregulation, and exercise capacity in ways that are measurable but often attributed to stress, depression, or poor fitness — making millions of people with treatable iron depletion receiving treatment for symptoms rather than their cause. The dietary distinction between heme iron (from animal sources, highly bioavailable) and non-heme iron (from plant sources, absorption enhanced by vitamin C and inhibited by calcium and polyphenols) has direct practical implications for diet planning that most people have never been taught.

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