Tamil: அரிசிக் கஞ்சி — Arisi kanji
English: Rice porridge or rice gruel
Traditional use: Diarrhoea, vomiting, fever, poor appetite, weakness and recovery after illness
Evidence rating: Useful as a soft, carbohydrate-containing supportive food; not proven to stop ordinary diarrhoea or replace oral rehydration solution
Preparation type: Rice cooked in a large quantity of water until very soft
Important limitation: Kanji may provide fluid and energy, but it does not contain the controlled balance of glucose and electrolytes needed to treat dehydration
Key points
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Gentle supportive food: Plain kanji may be easier to tolerate than rich, oily or heavily spiced food when appetite is reduced.
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Provides carbohydrate: Rice supplies energy during a period when someone may be eating less than usual.
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Contributes some fluid: Thin kanji contains water, but its fluid and electrolyte content is not standardised.
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ORS is different: Oral rehydration solution contains glucose and salts in specific proportions designed to replace diarrhoeal losses.
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Rice-based ORS is not rice water: Clinical studies used carefully formulated electrolyte solutions manufactured under controlled conditions—not ordinary household kanji.
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Continued feeding matters: People should eat when able, while babies should usually continue breastfeeding or normal-strength formula feeds.
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Seek help early: Babies, young children, older adults and people with long-term conditions can become dehydrated more quickly.
In many Tamil and Sri Lankan homes, kanji is the food prepared when the stomach will accept very little else.
The rice is cooked far beyond its ordinary texture until the grains soften into the water. It may be served plain, lightly salted or accompanied by something mild once the person begins to recover.
There are richer versions made with coconut milk, lentils, meat, garlic, fenugreek or greens. But when someone has diarrhoea, vomiting or a badly unsettled stomach, the bowl brought to the bedside is usually much simpler.
This instinct makes practical sense.
Plain rice porridge supplies water and carbohydrate in a soft form that may be easier to eat than a heavy meal. But it is important not to turn that sensible use into an exaggerated medical claim.
Kanji does not kill the organism causing gastroenteritis. It does not reliably stop diarrhoea. Most importantly, plain rice water is not the same as oral rehydration solution.
What is arisi kanji?
“Arisi” means rice in Tamil, while “kanji” refers to a thin porridge or gruel.
Its consistency can range from:
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Cloudy rice water containing very few grains
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Thin porridge with softened rice
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A thicker, spoonable porridge
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A substantial meal containing coconut milk, lentils, meat or vegetables
The simplest illness version usually contains:
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Rice
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Water
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Sometimes a small amount of salt
Some families add garlic, cumin, fenugreek, coconut milk or cooked lentil water.
These variations may be nourishing in their own ways, but they are not necessarily equally comfortable during active vomiting or diarrhoea.
Does kanji actually help diarrhoea?
The honest answer
Kanji may be useful as food and may help someone maintain a little fluid and energy intake, but ordinary kanji has not been proven to treat the cause of diarrhoea.
The main immediate danger from substantial diarrhoea and vomiting is dehydration. Water, sugar, salts and minerals are lost through watery stool and vomit. Those losses need to be replaced appropriately. WHO recommends oral rehydration solution as the central treatment for dehydration caused by diarrhoeal illness.
Plain kanji contains water and carbohydrate, but:
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The quantity of rice varies.
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The volume of water varies.
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Salt may be absent or added by guesswork.
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Its electrolyte content is uncontrolled.
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Some families serve only the strained liquid.
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Richer recipes may contain fat that is harder to tolerate during active illness.
For those reasons, kanji should be described as supportive food, not as rehydration medicine.
What may kanji genuinely provide?
Fluid
A thin bowl of kanji contains a substantial amount of water.
It may be useful when someone dislikes plain water or can manage a little food but not a full meal.
However, drinking kanji does not guarantee that the person is replacing the sodium and other electrolytes lost through repeated diarrhoea or vomiting.
Someone with significant fluid losses may still require oral rehydration solution even when they are eating kanji.
Carbohydrate and energy
Rice is a starchy food that supplies carbohydrate and energy.
During illness, that can be helpful because:
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Appetite may be reduced.
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Large meals may feel overwhelming.
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Fatty or highly spiced food may worsen nausea.
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The person may tolerate only a few spoonfuls at a time.
Kanji does not need to possess a mysterious medicinal property to be useful. Supplying manageable food during recovery is a legitimate benefit.
A soft texture
Cooking rice in plenty of water creates a soft texture that requires little chewing.
Some people find this easier to tolerate during:
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Nausea
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Fever
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Sore throat
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Weakness
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Reduced appetite
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Recovery after vomiting
This is a practical advantage rather than proof that kanji is medically “healing the gut.”
A way back to ordinary eating
Kanji can act as a bridge between drinking fluids and returning to a normal diet.
Once vomiting settles and the person feels able to eat, small amounts may be offered without forcing them to finish a full meal.
NHS guidance advises people with diarrhoea or vomiting to eat when they feel able and to avoid fatty or spicy foods when these worsen symptoms.
What is oral rehydration solution?
Oral rehydration solution—usually shortened to ORS—is a drink containing clean water, glucose and electrolytes in carefully controlled proportions.
It is designed to replace:
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Water
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Sodium
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Other salts and minerals lost through diarrhoea and vomiting
WHO describes ORS as an effective glucose-electrolyte solution capable of preventing or treating dehydration in people of all ages, except in the most severe cases where intravenous fluids may be needed.
In the UK, ORS is generally sold as sachets from pharmacies and some shops. Each sachet must be mixed according to its own packet instructions.
Follow the packet exactly
Do not:
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Guess how much water is required
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Assume every brand uses the same volume
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Divide a sachet by eye
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Add extra powder
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Add extra salt or sugar
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Make the solution stronger because the person appears very dehydrated
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Use an unmarked cup to estimate the water
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Mix it with milk, juice or fizzy drinks unless the specific product or a healthcare professional instructs you to do so
Use an accurately marked measuring jug where a volume must be measured.
Too much or too little water changes the concentration of the solution and may make it less safe or effective.
How does ORS work?
The small intestine can absorb sodium and glucose together through specialised transport systems.
When glucose and sodium are supplied in suitable proportions, their absorption encourages water to move from the intestine into the body.
This mechanism can continue working during many diarrhoeal illnesses, which is why ORS remains useful even while loose stools continue. WHO explains that ORS is absorbed in the small intestine and replaces water and electrolytes lost through diarrhoea.
ORS does not necessarily stop every loose stool immediately.
Its essential purpose is to prevent or correct dehydration while the illness improves.
A treatment can protect someone from dehydration without making the diarrhoea stop at once.
Why kanji water is not the same as ORS
Plain rice water may contain dissolved starch, but it does not reliably provide the correct electrolyte concentration.
A household preparation may be:
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Too dilute to replace sodium adequately
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Too salty if salt has been added carelessly
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Too thick to function as a rehydration drink
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Low in important electrolytes
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Made using an unknown rice-to-water ratio
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Contaminated through unsafe preparation or storage
ORS is scientifically formulated.
Kanji is cooked according to taste, memory and the preferred consistency of the household.
Both may have a place during illness, but their roles are different:
ORS is rehydration treatment. Kanji is supportive food.
Haven’t rice-based rehydration drinks been studied?
Yes—but this is where explanations often become muddled.
Researchers have studied polymer-based ORS, including formulas made with rice.
In these products, rice starch provides carbohydrate that releases glucose during digestion. Crucially, the formulas also contain controlled quantities of electrolytes.
A Cochrane review examined 35 trials involving 4,284 participants. Some polymer-based solutions reduced stool output or the duration of diarrhoea compared with older, higher-osmolarity glucose solutions. However, evidence was generally low or very low quality, and there was insufficient evidence that polymer-based ORS was superior to the current lower-osmolarity glucose ORS.
These rice-based formulas were manufactured or prepared under controlled research conditions.
They were not household rice porridge.
The research does not prove that:
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Plain rice water is equivalent to pharmacy ORS
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Every bowl of kanji treats dehydration
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Adding an estimated pinch of salt produces medical ORS
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Rice porridge stops ordinary childhood diarrhoea
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Kanji should replace standard ORS
The studied products were deliberately formulated rehydration solutions—not yesterday’s cooking water promoted to emergency medicine.
A simple illness-friendly kanji recipe
This version is intended as light supportive food.
It is not an ORS recipe.
Ingredients
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½ cup white rice
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1.25–1.5 litres of clean water
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A very small pinch of salt, optional
Method
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Check the rice and remove any debris.
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Rinse it in clean water.
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Place the rice and water in a clean saucepan.
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Bring it to a boil.
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Reduce the heat.
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Cook gently until the grains are extremely soft and beginning to break down.
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Add additional boiling water if the porridge becomes too thick.
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Mash some of the softened rice into the liquid if desired.
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Add only a very small quantity of salt if appropriate.
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Allow it to cool to a safe temperature.
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Serve in small portions.
The kanji may be eaten with a spoon or sipped from a cup when it is thin enough.
The optional salt is for flavour. It does not convert the dish into oral rehydration solution.
People following a salt-restricted diet because of high blood pressure, heart disease, kidney disease or another condition should follow their clinician’s advice rather than adding salt based on this recipe.
Should the rice be strained?
It does not need to be.
Keeping some softened rice in the bowl supplies more carbohydrate and substance than drinking only the cloudy cooking water.
Someone who is very nauseated may initially manage only a few sips of liquid. As they improve, the softened rice can be included.
There is no convincing reason to claim that all the “healing power” has entered the water and the rice itself should be discarded.
White rice or red rice?
White rice may be easier for some people to tolerate during a brief stomach illness because it generally contains less fibre than wholegrain or red rice.
Red and wholegrain rice can contribute more fibre to an ordinary balanced diet. During active diarrhoea, however, some people temporarily find higher-fibre food less comfortable.
This is not a universal rule.
The most appropriate version is one the person can tolerate, keep down and eat safely.
Should coconut milk be added?
Paal kanji and coconut-milk kanji are traditional, nourishing dishes, but they are richer than plain rice porridge.
Coconut milk contains a substantial amount of fat. During active nausea, vomiting or diarrhoea, rich food may be harder to tolerate.
A practical approach is:
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Begin with plain kanji during active illness.
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Add coconut milk later when appetite returns.
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Use a smaller amount when rich food causes nausea.
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Leave it out when it worsens diarrhoea or reflux.
Coconut milk does not transform kanji into a rehydration drink.
What about garlic, fenugreek and cumin?
These may be added according to family custom.
Garlic
Garlic can provide flavour and make plain kanji more appetising.
Culinary garlic in kanji has not been proven to kill the virus or bacterium causing acute gastroenteritis.
Large amounts may irritate the stomach in some people.
Fenugreek
Some households add fenugreek because it is associated with digestion, body heat or recovery.
Clinical evidence does not establish ordinary fenugreek kanji as a treatment for infectious diarrhoea.
Concentrated fenugreek preparations may also affect blood glucose or interact with medicines.
Cumin
Cumin adds aroma and flavour.
There is insufficient good human evidence that the quantity used in household kanji stops diarrhoea or treats gastroenteritis.
During active illness, complicated herbal mixtures are rarely the priority.
The person’s ability to retain fluid matters more than how many spices have been persuaded into the pot.
Should someone fast during diarrhoea?
Prolonged fasting is not usually required.
NHS guidance advises eating when able, while WHO and UNICEF include continued feeding among recommended measures during diarrhoeal illness.
Suitable food provides energy and nutrients during recovery.
Someone who is actively vomiting should not be forced to eat. Small, frequent amounts of fluid take priority initially.
Once food is tolerated, options may include:
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Kanji
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Plain rice
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Bread or toast
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Potatoes
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Banana
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Soup
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Familiar foods that are not excessively fatty or spicy
There is no need to remain on plain rice for several days once the stomach begins to recover.
Returning gradually to a varied normal diet provides a broader range of protein, fat, vitamins and minerals.
Babies and young children
Babies and young children can become dehydrated quickly.
Continue milk feeds
Breastfeeding should usually continue.
Formula-fed babies should continue receiving formula at its normal strength. NHS guidance specifically warns against diluting infant formula during diarrhoea or vomiting.
Rice water should not replace:
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Breast milk
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Infant formula
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ORS when medically advised
A baby who has started solids may be offered familiar food when willing, but hydration and usual milk feeds remain central.
Kanji is not complete baby food
Plain rice porridge mainly provides carbohydrate and water.
It is not nutritionally complete and should not become a baby’s only regular food.
Babies require adequate:
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Protein
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Fat
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Iron
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Vitamins
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Minerals
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Energy
A pale, wholesome-looking bowl can still be nutritionally underqualified for the full-time position.
Signs of dehydration
In babies and young children
Watch for:
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Fewer wet nappies or much less urination
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Few or no tears when crying
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A dry mouth, lips or tongue
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Sunken-looking eyes
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Unusual sleepiness
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Irritability or difficulty settling
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Refusing breast or bottle feeds
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Pale, mottled, blue or grey skin
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Rapid breathing
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Becoming difficult to wake
Babies, children and older adults are among those at greater risk of dehydration.
In adults
Watch for:
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Dark, strong-smelling urine
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Urinating much less than usual
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Dry mouth and lips
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Thirst
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Dizziness or light-headedness
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Unusual tiredness
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Weakness
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Confusion
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Fainting or collapse
Persistent signs of dehydration after ORS require medical advice.
How should ORS be given when someone is vomiting?
Small, frequent amounts may be easier to tolerate than a large cup given quickly.
Children may vomit a little when they first begin drinking ORS. Hospital guidance recommends continuing with frequent small amounts while monitoring the child, unless vomiting remains persistent or fluids cannot be retained.
Do not force a large quantity at once.
The stomach is already having a bad day. It does not need to enter a speed-drinking competition.
Seek medical advice when the person repeatedly vomits the solution or cannot retain any fluid.
Adults, older people and long-term conditions
Adults can also become seriously dehydrated, particularly when vomiting and diarrhoea occur together.
Risk may be greater in:
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Older or frail adults
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People with kidney disease
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People with diabetes
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People with heart disease
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People taking diuretics
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People with weakened immune systems
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Anyone unable to obtain or drink fluid independently
A pharmacist can advise whether ORS is suitable and when medical assessment is needed.
People with kidney disease, heart failure or a prescribed fluid restriction should follow their personalised clinical advice rather than drinking unlimited fluid or adding extra salt.
People with diabetes should follow their usual sick-day guidance, monitor their glucose as directed and seek help when they cannot retain fluids, food or medication.
Can kanji stop vomiting?
There is no good evidence that rice porridge directly switches off the vomiting reflex.
It may be tolerated after vomiting begins to settle, but offering food too quickly can provoke further nausea in some people.
Begin with:
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Small sips
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Frequent rather than large quantities
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ORS when dehydration is a concern
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Food once the person feels able
Persistent vomiting that prevents fluid intake requires medical assessment.
Does kanji treat food poisoning?
No.
Food poisoning can be caused by viruses, bacteria, parasites or toxins in contaminated food.
Kanji may provide light nourishment during recovery, but it does not neutralise toxins or destroy microorganisms inside the body.
The NHS advises taking small sips when nausea makes drinking difficult and eating when able. Persistent vomiting, bloody diarrhoea or signs of dehydration require medical advice.
Food safety: freshly cooked kanji matters
Cooked rice requires careful storage.
Some bacterial spores can survive cooking. If rice is left at room temperature, bacteria may multiply or produce toxins capable of causing illness.
The NHS advises cooling cooked rice within one hour, placing it in the fridge or freezer promptly and using refrigerated rice within 24 hours. Rice should be reheated no more than once.
That matters particularly when the food is being prepared for someone whose stomach is already staging a rebellion.
Safe storage
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Serve kanji as soon as practical after cooking.
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Do not leave it at room temperature for several hours.
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Cool leftovers quickly—within one hour.
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Refrigerate promptly.
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Use refrigerated rice within 24 hours.
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Reheat only once.
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Reheat until steaming hot throughout.
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Allow it to cool to a safe temperature before serving.
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Discard rice left at room temperature overnight.
These precautions are especially important for babies, pregnant people, older adults and anyone with a weakened immune system.
Should fermented leftover rice be used during illness?
Fermented rice preparations have their own cultural history across South Asia.
They should not be confused with freshly cooked illness kanji.
Household fermentation can vary in:
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Acidity
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Microbial content
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Preparation hygiene
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Fermentation time
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Storage temperature
During active vomiting or diarrhoea—particularly in a baby, pregnant person, older adult or immunocompromised person—freshly cooked food is the more cautious option.
The immediate priority is safe, easily tolerated food—not an experimental or highly variable fermented preparation.
Claims that naturally fermented rice automatically functions as a probiotic treatment for gastroenteritis are not supported strongly enough to recommend it for that purpose.
What kanji cannot do
Arisi kanji cannot be relied upon to:
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Replace oral rehydration solution
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Correct severe dehydration
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Stop every episode of diarrhoea
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Stop persistent vomiting
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Kill norovirus
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Cure food poisoning
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Treat cholera by itself
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Treat dysentery
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Replace antibiotics when medically required
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Replace intravenous fluids in severe dehydration
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Supply complete nutrition for a baby
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“Reset” or “detox” the digestive system
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Treat recurring or unexplained diarrhoea
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Make unsafe drinking water safe
It is supportive food—not a pharmaceutical rehydration formula, antimicrobial medicine or diagnosis.
When to seek medical help
Call NHS 111 or seek urgent medical advice when:
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You are concerned about a baby under 12 months
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A child stops breast or bottle feeding
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A child has substantially fewer wet nappies
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Someone still shows signs of dehydration after using ORS
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Vomiting continues and fluids cannot be retained
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There is blood in the stool
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Diarrhoea lasts longer than seven days
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Vomiting lasts longer than two days
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The person has a weakened immune system
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An older or frail person becomes weak, drowsy or confused
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A person with a long-term condition cannot manage fluids or regular medication
NHS guidance advises urgent assessment for persistent dehydration, inability to retain fluids, blood in the stool and prolonged diarrhoea or vomiting.
Call 999 or attend A&E for:
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Vomiting blood
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Vomit resembling coffee grounds
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Green vomit in an adult
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Yellow-green or green vomit in a child
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Sudden, severe abdominal pain
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Severe breathing difficulty
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Confusion or abnormal responsiveness
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Blue, grey, very pale or blotchy skin
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Suspected poisoning
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Collapse or rapid, severe deterioration
Preventing the illness from spreading
Infectious diarrhoea and vomiting can spread readily between people.
To reduce transmission:
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Wash hands thoroughly with soap and water.
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Clean toilet seats, taps, flush handles and door handles.
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Wash soiled bedding and clothing separately.
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Avoid sharing towels or utensils.
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Do not prepare food for other people while unwell.
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Stay away from work, school or nursery until at least 48 hours after the final episode of diarrhoea or vomiting.
NHS guidance recommends regular handwashing and remaining away from school or work for 48 hours after symptoms stop.
If you remember only three things
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Plain kanji can provide water, carbohydrate and manageable food while someone recovers.
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Kanji water is not the same as ORS and should not replace it when dehydration is a concern.
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Babies, young children, older adults and anyone unable to retain fluids need prompt medical attention.
Tradition and science: the final verdict
Arisi kanji deserves its place in Tamil and Sri Lankan household care.
Its value is practical:
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It is inexpensive.
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It uses ingredients found in most homes.
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It can be prepared plainly.
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It provides carbohydrate and water.
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Its texture may be easier to tolerate than a heavy meal.
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It allows food to return gradually when appetite is poor.
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It carries a familiar language of care.
The evidence supports saying:
Plain rice kanji can be a useful, gentle food during mild stomach illness and recovery, provided the person also receives adequate fluids and appropriate rehydration when needed.
The evidence does not support saying:
Rice water replaces ORS, stops diarrhoea or cures the infection causing it.
There is no need to belittle the bowl or inflate it into medicine.
Kanji can remain exactly what generations have needed it to be: simple food that asks very little of an exhausted body.
Preserve your family’s version
How was kanji prepared when someone was ill in your home?
Some families served only the cloudy water first. Others mashed the rice into the broth or added garlic, fenugreek, cumin or a little coconut milk later in recovery.
Readers may wish to record:
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Who usually prepared it
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Which rice variety was used
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Whether the rice was left whole or mashed
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Whether the cooking water was strained
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Whether salt was added
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Which spices, if any, were included
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Whether coconut milk was added during recovery
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What was served alongside the kanji
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Whether babies and adults received different versions
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Whether it was used for diarrhoea, fever or general weakness
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Whether the recipe changed after migration
The history of kanji lives in its restraint.
It is rice stretched with water, a bowl made soft enough for illness and a reminder that nourishment does not always need to arrive dressed for a feast.
Medical note
This article provides cultural and educational information. It is not a substitute for diagnosis, oral rehydration treatment, prescribed medicine or personalised advice from a doctor, pharmacist, dietitian or another qualified healthcare professional.
Always follow the instructions on an ORS packet exactly and follow your healthcare provider’s advice, particularly for babies, pregnancy, older age, long-term conditions or regular medication.
When you are uncertain whether symptoms require ORS, medical assessment or ordinary home care, seek professional advice.
Sources and Further Reading
Oral Rehydration and Diarrhoeal Illness
- World Health Organization and UNICEF. Oral Rehydration Salts: Production of the New ORS. Geneva: WHO, 2006. who.int — The primary WHO guidance on oral rehydration solution as the central treatment for dehydration caused by diarrhoeal illness; basis for the article's emphasis that plain rice water is not a substitute for ORS.
- Gregorio, Gerald V., et al. "Polymer-Based Oral Rehydration Solution for Treating Acute Watery Diarrhoea." Cochrane Database of Systematic Reviews, no. 12 (2016): CD006519. doi.org — The Cochrane review of 35 trials (4,284 participants) referenced in the article; found insufficient evidence that polymer-based (including rice-based) ORS was superior to current lower-osmolarity glucose ORS for ordinary diarrhoea.
- National Health Service (NHS). "Diarrhoea and Vomiting." NHS, UK. nhs.uk — NHS clinical guidance on managing diarrhoea and vomiting including when to seek medical advice; referenced in the article for clinical framing.
Rice and Digestive Recovery
- Mahan, L. Kathleen, and Janice L. Raymond. Krause's Food and the Nutrition Care Process. 14th ed. St Louis: Elsevier, 2017. — Standard clinical nutrition reference covering the role of easily digestible carbohydrates (including plain white rice) in recovery diets for gastrointestinal illness; supports the article's description of kanji as supportive food during recovery.
Traditional Use and South Asian Food Medicine
- Krishnaswamy, K. "Traditional Indian Spices and Their Health Significance." Asia Pacific Journal of Clinical Nutrition 17, Suppl. 1 (2008): 265–268. — Documents the role of rice-based preparations and spices in traditional South Asian home medicine, providing cultural context for Tamil household use of kanji during illness.
- Jayaweera, D. M. A. Medicinal Plants Used in Ceylon. 5 vols. Colombo: National Science Council of Sri Lanka, 1981. — Documents traditional Sri Lankan food-medicine practices including rice-based preparations for digestive illness and recovery.
