Why Teenage Girls Are at the Highest Risk of Iron Deficiency

Iron deficiency anaemia is the most common nutritional deficiency in teenage girls.¹ It's also almost entirely preventable. But it requires understanding how much iron is actually being lost, and which foods deliver it in forms the body can actually use.

Why girls are uniquely vulnerable

During the menstrual cycle, a teenage girl loses between 30 to 40 millilitres of blood per period², sometimes more if periods are heavy. Each millilitre of blood contains iron bound in red blood cells. That iron doesn't get recycled back into her body efficiently; it's lost.

Simultaneously, she's growing. Her body is expanding, which means her blood volume is increasing, which means her total iron requirement goes up. And if her periods are heavy, or if she's been raised on a diet low in iron, the mismatch between loss and intake becomes significant very quickly.

The result: by the time she's seventeen or eighteen, many girls have iron stores that are completely depleted. Some are anaemic. Most are what's called iron-depleted, meaning normal blood haemoglobin but no stored iron reserves.

A girl who's tired, cold, struggling to concentrate, and catching every bug is not weak or lazy. She's probably severely iron-deficient.

What iron deficiency actually looks like

Iron deficiency shows up as a cluster of symptoms that often get misattributed to other things:

• Exhaustion that doesn't improve with rest
• Difficulty concentrating or brain fog
• Cold intolerance, even when others are comfortable
• Frequent infections and slow recovery
• Pale skin, especially inside the lips and eyelids
• Shortness of breath with mild exertion
• Dizziness, especially when standing up quickly
• Hair loss or thin, brittle hair
• Weak nails that break easily
• Restless legs at night
• Cravings for non-food items (pica), like ice or dirt

These symptoms are often written off as "typical teenage behaviour" or attributed to mental health, when they're actually a straightforward nutritional deficiency. A blood test showing low ferritin (stored iron) or low haemoglobin (the iron-carrying protein in blood) confirms it.

The recovery from iron deficiency is measurable and dramatic. Once iron intake is restored, energy returns within weeks. Concentration improves. Cold tolerance normalises. The transformation is noticeable enough that you know you've addressed the right problem.

The foods that restore iron fastest

Not all iron is created equal. There are two types: heme iron (found in animal foods) and non-heme iron (found in plant foods). Heme iron is absorbed far more efficiently. Non-heme iron has lower bioavailability, and absorption is inhibited by compounds in plant foods like phytates and tannins.¹

This means that a teenage girl eating spinach and beans is absorbing far less iron than one eating red meat and organ meats, even if the amount on the plate looks equivalent.

The most effective foods for restoring iron in teenage girls:

• Liver. The single most iron-dense food available. A small serving of liver delivers as much iron as several servings of red meat. Liver pâté, sliced and fried, or minced invisibly into bolognese.
• Red meat. Beef, lamb, game. Cook it rare or medium-rare for maximum bioavailability. Several servings weekly is appropriate for a girl with iron deficiency.
• Shellfish. Oysters and clams are extraordinarily iron-rich, though not all girls will eat them. Mussels are a more approachable alternative.
• Dark poultry. Chicken thighs and duck are higher in iron than white meat, though not as iron-dense as red meat or liver.
• Fish. Sardines and mackerel in particular are iron-rich and also deliver omega-3 fatty acids.
• Eggs. The yolk contains iron, and the whole egg consumed together improves iron absorption.

Vitamin C dramatically improves iron absorption.¹ So serving red meat or liver with citrus, or taking it alongside tomato-based sauces, boosts the iron your body actually absorbs.