Iron reaches the gut in two chemically different forms. Heme iron — locked inside a porphyrin ring in meat, poultry and fish — enters through its own carrier and mostly ignores the rest of the meal. Non-heme iron — every other source — must be reduced and kept dissolved first, so everything eaten alongside it gets a vote. Set the two iron dials, flip the enhancers and inhibitors, and watch how many milligrams actually cross into the blood.
An empty meal
Two doors, two rule-books. Move a dial on the right and this diagram redraws itself.
The arithmetic of this meal
Iron absorbed0.00mg
Mix a mealset the iron, then toggle its company
Iron on the plate
Heme ironmeat, poultry & fish only — already inside a porphyrin ring0.0 mg
Non-heme ironplants, eggs, dairy, fortified & enriched foods — every other source0.0 mg
Enhancers · keep non-heme iron reduced & soluble
Inhibitors · bind iron before it reaches the transporter
Iron stores → hepcidin → the exit gate
Compare with a reference intake
No food here is "good" or "bad," and nothing on this page is advice for any individual. Phytate, polyphenols and calcium simply bind iron inside the gut — and the very same foods deliver fiber, folate, calcium and protein the body uses elsewhere. This is a teaching model of one meal's chemistry, built from published single-meal absorption studies. Real absorption varies enormously between people and between days, it cannot be read off a menu, and questions about testing, supplements or doses belong with a person's own clinician.