Miglior citazione da Haemochromatosis and the Hidden Danger of Iron Overload
The human body actually has no physiological pathway to excrete excess iron. Once it’s in, it’s in; the only way the body can manage it is by strictly guarding the 'front door' of absorption through the hormone hepcidin.
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The human body lacks a dedicated physiological pathway to excrete excess iron. While we have efficient mechanisms for absorbing iron from food, we cannot actively "throw it away" once it is inside the system. We only lose small amounts of iron passively through shedding skin cells, minor blood loss, or pregnancy. Because there is no "back door" for excretion, the body must strictly regulate the "front door" of absorption; if this regulation fails, iron inevitably piles up in vital organs over time.
Hepcidin is a hormone produced by the liver that acts as the body's master iron regulator, while ferroportin is a protein that acts as the physical "gate" on cells to let iron into the bloodstream. When the liver senses high iron levels, it releases hepcidin, which travels to the ferroportin gates and triggers the cells to break them down, effectively locking the door to further iron export. In hereditary haemochromatosis, a genetic mutation usually prevents the liver from producing enough hepcidin, leaving the ferroportin gates wide open and allowing the body to absorb excessive iron even when stores are full.
The condition is called the "Great Imposter" because its symptoms are often vague and mimic many other common ailments, making it difficult to diagnose without specific testing. It can present as chronic fatigue, joint pain (particularly in the knuckles, known as the "Iron Handshake"), or new-onset diabetes. Because the iron accumulation is a slow-motion process that takes decades to damage organs, patients often don't feel sick until their 40s or 50s, at which point the damage might be misattributed to aging or other unrelated diseases.
Doctors use a combination of two primary blood tests: Transferrin Saturation and Serum Ferritin. While ferritin measures total stored iron, it is also an "acute phase reactant" that rises due to inflammation, infection, or alcohol use. Therefore, a high ferritin level alone doesn't confirm haemochromatosis. If the Transferrin Saturation is also high (typically over 45%), it indicates that the iron transport system is overwhelmed, pointing toward a genetic regulatory failure. This is usually followed by HFE genetic testing to look for specific mutations like C282Y.
Therapeutic phlebotomy, or regular blood withdrawal, remains the gold standard treatment because it is highly effective and safe. By removing blood, the body is forced to pull stored iron from the liver and heart to create new red blood cells, effectively "emptying the vault." For those who cannot tolerate blood loss, such as patients with anemia or severe heart conditions, doctors may use iron chelation therapy—medications that help the body excrete iron through urine or stool. In the future, "hepcidin mimetics" (pills that mimic the missing hormone) may provide a way to prevent absorption entirely.
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"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
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