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Cooking in iron vessels: does it really help anaemia? | CION Cancer Clinics
Yes, a little. An iron kadai releases small amounts of iron into sour, wet dishes like sambar and tomato dal, which may help anaemia (a low haemoglobin, the oxygen-carrying protein in blood) caused by low iron. It is a useful habit, not a treatment. It will not fix anaemia that has another cause, and people who already store too much iron should ask their doctor first. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Does cooking in an iron kadai raise haemoglobin?
- Which dishes pick up the most iron from the kadai?
- How do you use and care for an iron kadai?
- What do people believe about iron vessels, and what is true?
- How does an iron kadai compare with other vessels?
- Who should not rely on an iron kadai?
- Common questions about cooking in iron vessels
The short answer
Does cooking in an iron kadai raise haemoglobin?
Yes, a little, and mainly when the cause of the low haemoglobin is too little iron. An iron kadai releases small amounts of iron into food, especially sour, wet dishes that cook for a long time. It is a useful kitchen habit. It is not a treatment, and it will not correct anaemia that is already moderate or severe.
How the iron gets into food
When acid from tomato, tamarind or lemon meets the bare iron surface under heat, some of the metal dissolves into the food. The longer the contact and the wetter the dish, the more moves across. A quick dry stir-fry picks up far less than a sambar that simmers for a long while.
What the studies show
Research from several low-income countries has found that food cooked in iron pots carries more iron, and some trials saw modest rises in haemoglobin in children and women. Other studies found little change. The trials are small, the amount of iron released varies from pot to pot, and results depend on what else people eat. The honest summary is that it can help as one part of a diet, and that the effect is hard to predict for any one family.
If you already take iron tablets on prescription, keep taking them exactly as advised. A kadai is not a reason to change them.In your kitchen
Which dishes pick up the most iron from the kadai?
Three things decide it: how sour the dish is, how much liquid it has, and how long it stays in the vessel.
Sour, simmered dishes
Sambar, rasam, pulusu, tomato dal and tamarind curries take up the most iron because acid, water and time all work together.
Good choices
- Tomato pappu
- Gongura or tamarind pulusu
- Sambar with drumstick
Leafy curries and dals
Palak, thotakura and methi cooked soft with dal pick up a fair amount, and they already carry iron of their own. Finish with a squeeze of lemon.
Dry fries and tadka
Short, dry cooking with little moisture moves only a small amount of iron. It is still fine to use the kadai for these, but do not count on them for iron.
Dishes to keep elsewhere
Milk, kheer and curd-based gravies can turn grey and taste of metal, and calcium works against iron anyway. Cook these in steel.
Do not store food in the kadai overnight. It turns dark and metallic, and the vessel rusts.Not sure whether this applies to you?
Ask an oncologistLooking after it
How do you use and care for an iron kadai?
-
Check what you are buying
Choose plain cast iron or wrought iron with no paint, lacquer or non-stick coating inside. A coated pan does not release iron. Ask the shopkeeper, and avoid vessels that feel unusually light.
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Season it before first use
Scrub off the factory oil, dry it on the flame, rub a thin layer of cooking oil over the inside and heat it until it stops smoking. Repeat a few times. This stops rust and makes food stick less.
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Cook sour dishes regularly
Use it for your everyday dal, sambar or curry rather than only for special dishes. Regular use matters more than any single meal.
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Empty it after cooking
Move food to a steel or glass bowl once it is done. Wash with mild soap or ash, dry it fully on the flame and wipe with a few drops of oil.
-
Deal with rust early
Light rust can be scrubbed off with tamarind or salt, then the vessel re-seasoned. A pan with deep pitting or flaking is better replaced.
Commonly believed
What do people believe about iron vessels, and what is true?
"If we cook in iron, she does not need to see a
doctor."
A kadai adds a small, uneven amount of iron. It does not explain why the haemoglobin is low. Heavy periods, worms, low vitamin B12 or an inherited blood condition need to be found, and a pot cannot find them.
"The blacker the food turns, the more iron it
has."
Dark colour and a metallic taste usually mean the food sat too long in the vessel or the pan is rusting. It is not a measure of useful iron, and it puts children off eating.
"Old people and children cannot take in iron from
cooking."
The iron released into food is absorbed like other plant iron, at any age. It is taken in better when the meal includes something sour and when tea is not drunk with it.
"More iron is always safer than less."
For most people, cooking iron is well within safe limits. For people whose bodies already store too much iron, extra iron from any source adds to the load, and that group needs advice from their own doctor.
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Side by side
How does an iron kadai compare with other vessels?
Plain iron kadai or tawa
Steel, aluminium, non-stick or clay
Adds some iron to sour, wet dishes
Adds no useful iron to food
Needs drying and oiling, or it rusts
Needs little special care
Can darken milk and curd dishes
Suits every kind of dish
Heavy, lasts for years with care
Non-stick coatings wear out and need replacing
Being straight with you
Who should not rely on an iron kadai?
An iron kadai suits most healthy families as a simple way to add iron. It does not suit people whose anaemia has a cause other than low iron, and it may not be right for people who already carry too much iron.
People who should ask their doctor first
If someone in your family has thalassaemia major, receives regular blood transfusions, takes medicine to remove iron from the body, or has been told they have haemochromatosis (an inherited condition where the body stores too much iron), ask their haematologist before cooking every meal in iron. Extra iron adds to a load the body already struggles with.
When a kadai is not enough
Breathlessness on stairs, a racing heart, fainting, very pale skin or nails, black stools, or heavy periods all mean a doctor should check the blood and look for the cause. The same applies if a repeat test shows no improvement despite good food.
What this page cannot tell you
It cannot tell you how much iron your own vessel releases or what your haemoglobin should be. Reference ranges differ between laboratories, and a single result is read with your symptoms and repeat tests.
Did you know
Part of the iron in traditional jaggery comes from the large iron pans it is boiled in. The same principle is at work in your kitchen kadai: the vessel, not only the food, can carry iron to the plate.
Questions we are asked
Common questions about cooking in iron vessels
How long before an iron kadai makes a difference?
There is no reliable timeline. In studies where it helped, the change came slowly, over months of everyday use, and was modest. If your haemoglobin was low enough to worry a doctor, do not wait to see whether cooking changes it. Follow the treatment plan and use the kadai alongside it.
Is an iron tawa as good as a kadai?
A tawa helps less. Rotis and dosas are cooked dry and quickly, so little iron moves into them. A kadai used for dals and sour curries does more of the work. Using both is fine, and neither replaces a varied diet with pulses, greens and millets.
What about iron fish or iron ingots placed in the pot?
These work on the same idea: a piece of iron simmered in a sour dish releases some of the metal. A few small trials abroad found benefits, but evidence is limited. If you use one, buy it from a reliable seller, keep it clean and dry, and do not treat it as a replacement for medical care.
Can cooking in iron cause too much iron?
For most healthy people, no, because the body limits how much iron it takes in from food. People with thalassaemia major, haemochromatosis or frequent transfusions are different, since their iron stores are already high. They should ask their haematologist before relying on iron vessels.
Is it safe to cook for a child or a pregnant woman in iron?
Yes, for most families this is a sensible habit. It does not replace iron and folic acid prescribed in pregnancy, or a child's check-up for anaemia. Keep dishes that turn dark or taste metallic out of the kadai, so children are not put off their food.
Does rust from the kadai give extra iron?
Rust is not a useful source of iron and it spoils the taste and colour of food. Scrub it off, dry the vessel on the flame and oil it lightly. A pan that keeps rusting after re-seasoning, or has deep pits, is better replaced.
My haemoglobin stayed low even with iron cooking. Why?
The cause may not be low iron. Low vitamin B12 or folate, thalassaemia trait, slow blood loss, kidney disease or, less often, a marrow problem can all keep haemoglobin low. A haematologist can read your blood report, including ferritin and cell size, and work out which applies.
Can CION look at my blood report?
Yes. Bring or send every blood report you have, old and new, and a list of medicines and supplements. CION's haematology team, including Dr. Basudev Pokhrel, reviews the full picture, explains what the results mean and suggests which tests, if any, are needed next.
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Sources
- NHS — Iron deficiency anaemia
- NHLBI — Iron-Deficiency Anemia
- World Health Organization — Anaemia
- NHS — Haemochromatosis
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
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