The short version
The Charaka Samhita has a famous list of "foremost things": for each kind of effect, the one thing that does it best. In Sutrasthana 25.40, that list says ekashana bhojana, eating once a day, is foremost among the things that make food digest easily. The same list then gives two warnings. Atimatrashana, eating more than you need, is the foremost cause of ama, food that has not been properly digested. And anashana, not eating at all, is the foremost among the things that shorten life.
So the line on one meal a day is not a licence to stuff yourself once, and it is not a case for going without food. This page is the full version of our reel on the same verse. It has the Sanskrit lines, Charaka's own reason for leaving time between meals, what a modern trial of one meal a day found, where a planned fast fits, and what the one meal's plate should hold, using the same list.
Explore Ayurveda Hub →इस लेख को हिंदी में पढ़ें: दिन में एक बार भोजन: चरक संहिता का एकाशन और उसकी दो चेतावनियाँ
📖 12 min read · Charaka Samhita, Sutrasthana 25.40 and 22.18
What this article covers
- The agrya list: Charaka's foremost things (Sutrasthana 25.40)
- The lines on eating, word by word
- Ekashana: why one meal digests easiest
- Atimatrashana: the first warning, don't stuff the one meal
- Anashana: the second warning, don't stop eating
- Upavasa is not anashana: where a planned fast fits
- Sarvarasa: what the one meal's plate should hold
- Before you try one meal a day
- From our shelf
- More to read on this topic
- Frequently asked questions
The Agrya List: Charaka's Foremost Things (Sutrasthana 25.40)
Chapter 25 of the Charaka Samhita's Sutrasthana is the Yajjah Purushiya Adhyaya. It opens with a debate among sages about where a person and their illnesses come from, and it turns to food: what is wholesome, what is not, and why. We walk through the whole chapter in Charaka Samhita Part 25. This page stays with one passage.
Verse 40 is a long list that Ayurveda teachers call the agrya sangraha, the collection of foremost things. Each entry has the same shape: this thing is foremost among things that do that. Water is foremost among things that refresh. Exercise is foremost among things that make the body steady. The list runs to well over a hundred entries, and a good number of them are about food.
Our reel took four entries from that one list, and this page adds the ones that sit around them. Taken together, they read like a short guide to how often and how much to eat.
Texts like the Charaka Samhita were once kept as palm-leaf bundles like this one, between boards and tied with a cord.
The Lines on Eating, Word by Word
Here are the entries on eating, in the Sanskrit printed in the Charaka Samhita edition of the Charak Samhita Research, Training and Skill Development Centre (2020). They are scattered through verse 40, not printed together.
Charaka Samhita, Sutrasthana 25.40 (the entries on eating)
अन्नं वृत्तिकराणां श्रेष्ठम्
एकाशनभोजनं सुखपरिणामकराणां
अतिमात्राशनमामप्रदोषहेतूनां
अनशनमायुषो ह्रासकराणां
प्रमिताशनं कर्शनीयानाम्
यथाग्न्यभ्यवहारोऽग्निसन्धुक्षणानां
गुरुभोजनं दुर्विपाककराणाम्
सर्वरसाभ्यासो बलकराणाम्
एकरसाभ्यासो दौर्बल्यकराणां
The translation below is our plain rendering, checked against the 2020 edition's English.
Nine entries, in plain words
1. Annam: food is foremost among the things that keep life going.
2. Ekashana bhojana: eating once a day is foremost among the things that make food digest easily.
3. Atimatrashana: eating more than you need is the foremost cause of ama problems.
4. Anashana: not eating is foremost among the things that shorten life.
5. Pramitashana: eating too little is foremost among the things that make a person thin and weak.
6. Yathagni abhyavahara: eating according to your digestive fire is foremost among the things that kindle it.
7. Guru bhojana: heavy food is foremost among the things that are hard to digest.
8. Sarvarasa abhyasa: regularly eating all the tastes is foremost among the things that give strength.
9. Ekarasa abhyasa: regularly eating food of only one taste is foremost among the things that weaken.
Notice how the entries pull against each other. One meal a day digests easily, but eating too much and eating too little each have their own entry, and so does not eating at all. Charaka is not handing out a single rule. He is marking the edges of the road.
Ekashana: Why One Meal Digests Easiest
The line itself is short: ekashana bhojanam sukha parinama karanam. Eka is one, ashana is eating, and sukha parinama is easy, comfortable digestion, food turning into what the body can use without trouble. The Sanskrit gives no time frame. The 2020 edition's English reads it as taking food only once in 24 hours, and that is the everyday meaning: one meal a day.
Charaka does not explain the line where it stands. But his own rules of eating, in Vimanasthana 1.24, give the reason that fits it. One of those rules is jirne ashniyat: eat after the previous meal has been digested. The next verse explains why. If you eat before the earlier meal is digested, the new food mixes with the undigested food and quickly upsets all three doshas. One meal a day is the simplest way to keep that rule: the whole day goes to digesting a single meal, and nothing new arrives on top of it.
That is the claim the reel opened with, credited to the text: Charaka calls one meal a day the easiest to digest. It is a statement about digestion, not about weight, and not about how many meals everyone must eat.
It is fair to ask what modern research says, because one meal a day is now a popular trend. One of the best-known trials is "A controlled trial of reduced meal frequency without caloric restriction in healthy, normal-weight, middle-aged adults" by Kim Stote and colleagues, published in the American Journal of Clinical Nutrition in 2007. Healthy adults ate all the food they needed to keep their weight either in three meals a day or in one meal a day, for eight weeks each, in random order. On one meal a day, they lost some body fat. They were also significantly hungrier, their blood pressure went up, and their total, LDL and HDL cholesterol all rose.
So the modern picture is mixed. A small trial is not the last word, and it did not test Charaka's line, which is about how easily food digests. But it is a good reason not to see one meal a day as a shortcut to health.
Atimatrashana: The First Warning, Don't Stuff the One Meal
Here is the trap in one meal a day. If you eat only once, it is tempting to make up for it: a full plate, then seconds, then a sweet, until you can barely get up from the table. The same list in verse 40 has an entry for exactly that. Atimatrashanam ama pradosha hetunam: eating more than you need is the foremost cause of ama problems.
The trap in one meal a day: making up for it at the one meal. The same list calls eating more than you need the foremost cause of ama.
Ama is one of Ayurveda's key ideas. In plain words, it is food that the digestive fire, agni, could not fully digest: a heavy, sticky leftover of a meal the body could not finish processing. When the fire is given more than it can handle, the excess is not burned cleanly. Charaka's rules of eating make the same point from the other side: matravat ashniyat, eat in the right quantity (Vimanasthana 1.24), so that the doshas are not disturbed.
Two more entries from the same list help here.
Yathagni abhyavahara: eat according to your digestive fire. The list calls this foremost among the things that kindle the fire. The right amount is not fixed. It is what your own fire can digest today, which changes with the season, your work and your age.
Guru bhojana: heavy food is foremost among the things that are hard to digest. A single meal piled with fried, rich and heavy dishes asks the most of the fire at once. If you eat once, keep the heavy part of the plate small.
The same one meal, eaten to comfort: what your digestive fire can handle, with room left on the plate.
Try this. At your one big meal, serve yourself once, eat slowly, and stop when you feel comfortable, not full. You should be able to get up and walk without that heavy, sleepy feeling. If you are always hungry again in an hour, the plate is missing something, not the clock.
Anashana: The Second Warning, Don't Stop Eating
The other edge of the road is not eating at all. Anashanam ayusho hrasa karanam: not eating is foremost among the things that shorten life. It is one of the strongest lines in the whole list, and it sits in the same verse as the praise for one meal a day.
The reason is in the list's very first entry: annam vrittikaranam shreshtham, food is foremost among the things that keep life going. Life runs on food. Going without it is not a cleanse or a test of willpower; it takes away the thing the list ranks first. The list also has a milder warning for eating too little: pramitashanam karshaniyanam, eating too little is foremost among the things that make a person thin and weak.
Skipping the meal is not ekashana. The list ranks not eating foremost among the things that shorten life.
Many people slide into anashana without meaning to. Breakfast is skipped because there is no time, lunch is pushed back by meetings, and the first real food of the day comes late at night. That is not one meal a day by choice. It is going hungry, and Charaka's list counts it against you.
Try this. If you eat once a day, fix the time and keep it. Choose the hour when you are usually hungriest, and do not let work push the meal into the night. One proper meal at a steady hour is ekashana. A skipped day is not.
Upavasa Is Not Anashana: Where a Planned Fast Fits (Sutrasthana 22.18)
Does this mean Ayurveda is against fasting? No. Charaka draws a clear line between not eating and a planned fast. In Sutrasthana 22, the chapter on lightening and nourishing measures, verse 18 lists the ten methods of langhana, lightening the body:
Charaka Samhita, Sutrasthana 22.18
चतुष्प्रकारा संशुद्धिः पिपासा मारुतातपौ। पाचनान्युपवासश्च व्यायामश्चेति लङ्घनम्॥
The four kinds of cleansing, thirst, wind and sun, digestives, upavasa (fasting) and exercise: these are langhana.
Upavasa, fasting, is on that list. It is a measure a physician uses for a particular person, for a particular reason, for a limited time. We explain the whole chapter in Charaka Samhita Part 22. The CSRTSDC edition's own notes add that langhana does not suit conditions caused by vata alone, which is a reminder that a fast is not right for everyone.
The religious fasts of the Indian year, a vrat for a festival or a day of the week, are planned and limited too. What matters after a long fast is how you return to food: gently, starting light. We describe the classical way back, step by step, in How to Break the Navratri Fast.
So the warning in verse 40 is not about your vrat. It is about anashana: going without food again and again, or for long, with no plan and no end.
Sarvarasa: What the One Meal's Plate Should Hold (Sutrasthana 25.40)
If you eat once, that one plate has to carry the whole day. The same verse tells you what it should hold. Sarvarasabhyaso balakaranam: regularly eating all the tastes is foremost among the things that give strength. And its opposite: ekarasabhyaso daurbalyakaranam, eating food of only one taste day after day is foremost among the things that weaken.
Ayurveda counts six tastes: sweet, sour, salty, pungent, bitter and astringent. A plate built around all six is closer to the list's "all the tastes" than a bowl of one thing. We cover the six tastes and Vagbhata's daily plate in The Six Tastes of Ayurveda. For a one-meal day, a simple way to cover them is:
Sweet: rice or roti, which make up the base of the meal. Sour: curd, a squeeze of lemon, or a little tamarind. Salty: the salt in the dal and sabzi. Pungent: ginger, pepper and the spices of the tadka. Bitter: methi, karela or another bitter green. Astringent: the dal itself, chana, or leafy greens.
A one-line check. Before you eat your one meal, look at the plate and name the six tastes. If you can only find one or two, add a small bowl, not a bigger heap.
Before You Try One Meal a Day
Charaka's list describes what is foremost for easy digestion. It does not say that everyone should eat once a day, and the text itself keeps returning to the person: their digestive fire, their strength, their season. Today we would add a few plain cautions.
Talk to your doctor first if you are pregnant or breastfeeding, if you take medicine for blood sugar or blood pressure, if you have struggled with eating and weight in the past, if you are older and your appetite is already small, or if your work is hard physical labour. Children and teenagers need regular meals while they grow. If one meal a day leaves you dizzy, weak or unable to think clearly, stop and eat.
For everyone else, the two warnings of verse 40 are the real lesson. Whether you eat once, twice or three times a day: don't stuff yourself, and don't go without. Eat what your fire can digest, at a steady hour, from a plate that has all the tastes.
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More to read on this topic
Related story
The Ayurvedic Rule That Ends Dieting — another everyday eating rule from the classical texts, told in a few slides.
Frequently asked questions
Does the Charaka Samhita say to eat once a day? +
Charaka Samhita Sutrasthana 25.40 says that eating once a day (ekashana bhojana) is foremost among the things that make food digest easily. It is one entry in a list of foremost things, not an order for everyone. The same list warns that eating more than you need is the foremost cause of ama, and that not eating is foremost among the things that shorten life.
What does ekashana mean? +
Eka means one and ashana means eating, so ekashana is eating once. In the line ekashana bhojanam sukha parinama karanam, it is the habit of taking one meal a day; the 2020 edition's English renders it as taking food only once in 24 hours.
Why would one meal a day digest more easily? +
Charaka's rules of eating in Vimanasthana 1.24 say to eat only after the previous meal has been digested, because food eaten on top of an undigested meal mixes with it and quickly upsets all three doshas. With one meal a day, the whole day goes to digesting that meal before the next one arrives.
What is ama in Ayurveda? +
Ama is food that the digestive fire, agni, could not fully digest: a heavy, sticky leftover of a meal the body could not finish processing. Charaka's list names eating more than you need (atimatrashana) as its foremost cause.
Is fasting bad according to Ayurveda? +
Not a planned fast. Charaka lists upavasa, fasting, among the ten methods of langhana in Sutrasthana 22.18, a measure a physician uses for a particular person and reason. What Sutrasthana 25.40 warns against is anashana, going without food, which it ranks foremost among the things that shorten life.
Is one meal a day (OMAD) healthy? +
The research is mixed. In a 2007 trial by Stote and colleagues in the American Journal of Clinical Nutrition, healthy adults who ate the same food in one meal a day instead of three lost some body fat, but they were hungrier and their blood pressure and cholesterol rose. Talk to your doctor before you try it, especially if you take medicine, are pregnant, or have struggled with eating in the past.
What should I eat if I eat only once a day? +
The same verse says regularly eating all the tastes is foremost for strength, and eating only one taste weakens. Build the plate around all six tastes, keep heavy and fried food small, and eat only as much as your digestive fire can handle, at a steady hour.
Where is this in the Charaka Samhita, and which edition is used? +
Charaka Samhita, Sutrasthana, chapter 25 (Yajjah Purushiya Adhyaya), verse 40, with the fasting line from chapter 22, verse 18, and the rules of eating from Vimanasthana 1.24. The Sanskrit on this page follows the 2020 edition of the Charak Samhita Research, Training and Skill Development Centre; the plain-English renderings are our own, checked against that edition.
