Stale Food in Ayurveda: Charaka Samhita Sutrasthana 8.20 on Paryushita, the Five Exceptions and the Fridge

इस लेख को हिंदी में पढ़ें: बासी खाना और आयुर्वेद: चरक संहिता सूत्रस्थान 8.20, पाँच छूट और फ्रिज

📖 19 min read · Charaka Samhita, Sutrasthana 8.20, 5.10 and 27

Yesterday's Rice, Today's Tiffin: The Habit and the One Thing We Get Wrong

Open almost any fridge in an Indian home and you will find the same steel bowls: last night's rice, a little dal, the end of a sabzi. Cooking once for two meals saves time, gas and effort. The rice is warmed up at lunch, and the rest goes into tomorrow's tiffin. Most of us were also taught never to waste food, so keeping it feels like the right thing to do.

Our reel on this topic began with one line: before you heat yesterday's rice today, know this. Here is what to know.

The common belief is that heat makes it safe. If the rice is hot, we think, the problem is gone. The UK Food Standards Agency (FSA) says the problem lies somewhere else. In its Home food fact checker it writes: It's not the reheating that causes the problem, but the way the rice has been stored before it's reheated. What matters most happened earlier: how long the rice sat warm after cooking, how fast it was cooled, and how long it was kept. A hot pan at lunch does not make up for a warm night on the stove.

On the Ayurveda side there is a second belief to correct: that Ayurveda simply says "never eat leftovers". The Charaka Samhita is more exact. Its rule against stale food (paryushita) comes with five exceptions, foods the text allows even when they were not made fresh.

So this page has two halves: first the verse, clause by clause, and what it allows; then the modern half, from what happens to cooked rice overnight to what a fridge can and cannot do.

Where the Rule Sits: Charaka Samhita, Sutrasthana 8.20

The Charaka Samhita opens with the Sutrasthana, the section of first principles. Its eighth chapter is the Indriyopakramaniya Adhyaya, the chapter on the senses (indriya), and it ends with sadvritta, a long code of good conduct: how to speak, how to work, whom to trust and how to eat. We cover the whole chapter in Charaka Samhita Part 8. This page stays with one clause of one verse.

Verse 20 is Charaka's etiquette of eating, one long sentence of "do nots". Some belong to their age, such as the offerings to be made before a meal. Others still read as plain good sense: wash your hands, feet and face before you eat, do not eat from unclean vessels, do not eat at the wrong place or time or in a crowd, and do not eat with a troubled mind.

Then come three short food rules, one after another. Do not eat stale food, except five things. Do not eat up everything on your plate, except five other things. And do not eat curd at night. The plate rule, the clause called nashesha bhuk, has its own page: Should You Finish Your Plate? Here we take the first of the three, the stale-food clause, na paryushitam.

Na Paryushitam Anyatra: The Clause, Word by Word

Here is the clause in the Sanskrit of the 2020 edition by the Charak Samhita Research, Training and Skill Development Centre (CSRTSDC), which is online at carakasamhitaonline.com.

Word by word:

Na: not.

Paryushitam: stale. The word means "that which has stayed over" (pari plus ushita, from the root vas, to stay): food kept from an earlier cooking, usually overnight. It is the Hindi basi.

Anyatra: except, other than. The whole meaning of the clause turns on this word, so it gets its own section below.

Mamsa: meat.

Haritaka: greens, the fresh herbs and relishes of Charaka's group of greens (haritavarga).

Shushka shaka: dried vegetables. Shushka means dry, and shaka means a vegetable, often a leafy one.

Phala: fruits.

Bhakshya: prepared eatables, the flour preparations Charaka describes in his chapter on food.

-ebhyah: the ending on the whole list. It marks all five as the things set apart from the rule.

The clause has no verb of its own. It shares one with the clause just before it in the same sentence, annam adadita, "one should take food (anna)". So the full sense is "one should not take stale food".

Why Anyatra Means "Except": Reading the Sanskrit

Two English readings of this clause are in circulation, and they point in opposite directions.

The CSRTSDC edition, whose Sanskrit we use throughout, gives this English for the clause: One should not take stale food (meat, salad, dry vegetables, fruit and hard eatables). In that rendering the word anyatra does not appear, and the five foods read as examples of stale food. Read that way, Charaka would be warning you away from kept meat, kept greens and the rest.

Now look at the very next clause of the same verse, the plate rule:

It has the same shape: a rule, then anyatra, then a list of five foods with the same ending, -bhyah. And here the same edition translates anyatra as "except": One should not finish the all food (served in the plate) articles except the curd, honey, salt, roasted grain flour and ghee (these should be finished).

The same word, in the same sentence and the same grammar, should mean the same thing. If anyatra means "except" for curd (dadhi), honey (madhu), salt (lavana), sattu (saktu) and ghee (sarpi), it means "except" for the five foods of the stale-food clause too: not stale food, except these five.

We are not alone in that reading. The English Charaka Samhita: Handbook on Ayurveda (Volume I, 2002-2003, page 222) lists the line among its "should nots" as take stale things except meat, salad, dry vegetables, fruits and hard eatables, and adds a note in brackets: these items may be kept and eaten again at a second or later meal; they need not be prepared fresh for each meal.

Charaka's Full List of Exceptions: What the Text Allows the Next Day

Here is the full list, in the verse's own order. The food chapter we draw on is Sutrasthana 27, the Annapanavidhi Adhyaya, Charaka's long survey of foods and drinks, group by group (varga).

Four of the five exceptions: fresh greens (harita), dried leaves (shushka shaka), fruit (phala) and sweet cakes, a kind of bhakshya. The fifth, meat (mamsa), is not pictured.

1. Mamsa: meat

Meat (mamsa) comes first. The verse does not say which meat dishes it means or why, and we have not found a line in Charaka's food chapter that explains it, so we offer no reason.

One caution does exist elsewhere. In Sutrasthana 5.10, in the Matrashitiya Adhyaya, Charaka lists dried meat (vallura) among foods not to be eaten as a habit, because it is heavy (guru) to digest. The same verse names dried vegetables, so we return to it below.

2. Harita: greens

The sixth group in Sutrasthana 27 is the haritavarga, which the CSRTSDC edition calls "the section on greens" (Sutrasthana 27.166-177). It names fresh ginger (ardraka), lemon (jambira), radish (mulaka), holy basil (surasa), coriander (dhanyaka), onion (palandu) and garlic (lashuna), among others. These are herbs and relishes that sit beside a meal, not cooked dishes. Sutrasthana 27.318 says the rules for greens are the same as for vegetables, except in the mode of preparation, and the Handbook on Ayurveda edition simply calls this group "salads".

On a plate today these are the slices of onion and radish, the wedge of lemon and the sprig of coriander. That comparison is ours, not the text's.

3. Shushka shaka: dried vegetables

Shaka is Charaka's word for vegetables, and they have their own group in Sutrasthana 27. Shushka shaka are vegetables that have been dried so that they keep.

Here the text adds a limit. Sutrasthana 5.10 names dried meat, dried vegetables and two parts of the lotus, the tuber (shaluka) and the stalk (bisa), as foods that, in the CSRTSDC English, one "should not be habitual to take", as these are heavy to digest. The Sanskrit is valluram shushkashakani shalukani bisani cha, nabhyased gauravat: do not make a habit (abhyasa) of them, because of their heaviness (gaurava).

So the two verses fit together. Sutrasthana 8.20 says dried vegetables do not fall under the stale-food rule. Sutrasthana 5.10 says that does not make them everyday food. The exception is a permission, not a recommendation.

4. Phala: fruits

Fruit (phala) is the fourth exception, and a whole fruit needs no cooking at all. Here too the food chapter draws a line. Sutrasthana 27.317, in the CSRTSDC English: Fruits that are old, unripe or damaged by insects, snakes, frost or sun, and those that are of improper season and place or are putrified should be regarded as not good for use. The exception covers fruit that is still good, not fruit that has gone bad.

Modern advice says something close to this in its own terms. The FSA's fact checker says overripe fruit, such as brown bananas, can be eaten normally, as long as they don't contain any mould, and that Food that is obviously rotten or containing mould should not be eaten.

5. Bhakshya: prepared eatables

The last exception is bhakshya, prepared eatables. In Sutrasthana 27.267-276 Charaka describes a family of flour preparations and calls them bhakshya. The CSRTSDC edition names shashkuli, madhukroda, pindaka, pupa and pupalika (the last, it explains, a kind of sweet cake fried in ghee or oil), and the many preparations of wheat mixed with unctuous substances or cooked with them. It calls most of them heavy, and Sutrasthana 27.276 adds that whether such a food is heavy or light depends on what goes into it, how it is made and how much of each part is used.

Today's nearest kin are the batch-made mathri, thekua and laddoo many homes keep in a tin; that comparison is ours. Whether an everyday roti counts as a bhakshya the text does not say: its examples are richer flour preparations, several of them fried.

Why Moist Cooked Food Is the Problem: Rice, Dal and Sabzi Overnight

Charaka gives no reason for his line. Modern food safety has its own reasons for care with cooked food, and the clearest statement of them is the FSA's advice on rice.

The habit the FSA warns against: cooked rice left to cool in its pot overnight. How long rice sits like this matters more than how you reheat it.

Here is what the FSA's Home food fact checker (last updated 21 August 2026) says, in its own words:

• Uncooked rice can contain spores of a bacterium called Bacillus cereus.
• The spores of Bacillus cereus can survive being cooked.
• The longer cooked rice is left at room temperature, the more likely it is that the bacteria or toxins will make the rice unsafe to eat.

In plain words: cooking does not make rice sterile. Some hardy spores live through the boiling, and while the cooked rice sits warm, on the stove, in the cooker or on the counter overnight, they can wake up and grow, and the bacteria can make toxins. Heating the rice again the next day is not a reset button: that is the FSA's point when it says the problem is the storage, not the reheating.

What about dal and sabzi? The FSA's wider guidance, How to chill, freeze and defrost food safely, covers all cooked food. It lists cooked dishes among the foods you should always store in your fridge. It says not to put hot or warm food straight in, but to cool cooked food at room temperature and place in the fridge within one to two hours. And it names the range to avoid, 8 to 63°C, which it calls the Danger Zone: Between these temperatures the bacteria may grow and make you ill.

An Indian kitchen sits inside that range for most of the year in most of the country. A pot of dal left on the stove after dinner, or a cooker of rice left to cool overnight, spends the whole night in the Danger Zone. The FSA gives cooked rice its own, shorter limit because of those spores. For other leftovers its limit is 48 hours, which is still short.

Five Rules for Keeping Leftovers Safe

This is the part our reel promised. All five rules come from the FSA's Home food fact checker, written for cooked rice, the leftover that needs the most care; where the FSA's chilling guidance adds something for other cooked food, we note it.

Rule one in practice: rice spread out in small containers cools faster, so it can go into the fridge within the hour.

1. Cool it fast. If you have leftover rice you should chill it as quickly as possible, ideally within one hour. Dividing it into smaller portions helps, the FSA says, and don't leave rice in the rice cooker, steamer or pan to cool down. In an Indian kitchen that means not leaving it in the pressure cooker or the patila on the stove. For other cooked food, the chilling guidance gives one to two hours.
2. Keep it in the fridge. Once it is cool, it goes into the fridge, not onto the counter or into a closed cupboard. The FSA's guidance is that a fridge should run between 0 and 5°C.
3. Eat cooked rice within 24 hours. Put the rice in the fridge and consume within 24 hours. For other leftovers, its chilling guidance says: Eat leftovers within 48 hours.
4. Reheat only once. You should never reheat rice more than once. Take out only the portion you will eat and heat that. Nothing goes back into the fridge to be heated again tomorrow.
5. Steaming hot all the way through. When you reheat any rice always check the dish is steaming hot all the way through. Warm on top and cool in the middle is not enough. If you use a microwave, stir halfway: the FSA notes that microwaved food can be very hot at the edges and still be cold in the centre.

The Fridge: What It Does, and What It Cannot Do for Paryushita Food

Our reel's comment word is FRIDGE, so here is what a fridge actually does, and where it stops helping.

Cold slows bacteria down but does not stop them: the FSA's time limits still apply in the fridge.

It slows; it does not stop. The FSA's chilling guidance says: Putting food in the fridge slows bacterial growth so it is safe to eat. It is careful about the limit: Generally, the colder the temperature, the slower bacteria will grow - but cold temperatures don't stop bacteria growing altogether. A fridge is a clock that runs slower, not a clock that stops, and the FSA's limits hold even in the fridge: 24 hours for rice, 48 hours for other leftovers.

It only works at the right temperature. The FSA recommends a fridge thermometer, checked once a week, to keep it between 0 and 5°C, and says not to leave the door open for long, because the fridge then has to work harder to bring the temperature down.

The freezer is different. The FSA calls a freezer a pause button: food in a freezer won't go bad and most bacteria cannot grow in it. But it adds: The bacteria haven't been killed, and they may be revived as the food defrosts. For rice, the FSA says: into the freezer within an hour of cooking, defrost it in the fridge, and reheat it until steaming hot.

What it cannot do. A fridge cannot undo the hours before the food went in: rice that sat warm all night is not rescued by a cold morning. Nor can it make kept food fresh in Charaka's sense. His verse sorts food by what it is and whether it has been kept over, not by where it was kept. Charaka wrote long before refrigeration; his rule names no number of hours and makes no allowance for cold storage, and we will not invent one for him. Cold-kept dal is still kept dal: by the text it is paryushita, and by the FSA it is food on a short clock.

Cook to Need: Charaka's Rule in an Indian Kitchen Today

The simplest way to follow both Charaka and the FSA is to have less to keep.

Cook to need: two plates, one pot, and nothing left over to keep.

Cook to need. Measure rice by the number of people eating, not by habit or the size of the pot, and cook dal and sabzi in a smaller pot when fewer people are home. If a little is left, eating it at the next meal the same day, cooled and kept cold in between, is closer to both rules than keeping it for tomorrow.

Rethink the next day's tiffin. Packing last night's dinner is how yesterday's food reaches many offices and schools. There are two honest options. The first is a fresh tiffin: a few rotis and a dry sabzi made in the morning, or rice cooked fresh. The second, if you do pack leftovers, is to follow the five rules all the way: rice cooled within an hour last night, kept in the fridge, packed cold and eaten within 24 hours. The FSA says Rice may be eaten cold if it is cooled down quickly. But a packed tiffin then sits at room temperature until lunch, which is exactly what the FSA warns about, so keep that gap short.

Lean on Charaka's exceptions. In today's terms, the foods the text allows the next day are the easy ones to carry and keep. These examples are ours, not the text's:

• Fruit (phala): a banana, an orange or a guava travels well and needs no cooking and no reheating.
• Dried vegetables (shushka shaka): dried fenugreek leaves and other sun-dried vegetables keep well as ingredients, cooked fresh when you need them. Remember Sutrasthana 5.10: not as a daily habit.
• Dry prepared eatables (bhakshya): batch-made mathri, thekua or laddoo are the nearest thing today to what the text exempts, though Sutrasthana 27 counts such flour preparations as heavy, so a little goes a long way.
• Fresh greens (harita): onion, radish, lemon, ginger and coriander, cut fresh at the meal.

Serve less. The clause right after this one in the same verse asks you not to eat up everything on your plate. Cooking to need is the bridge between the two rules: nothing left to force down, and nothing left to keep. We cover that clause in Charaka Samhita on Nashesha Bhuk.

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