Walk into a supermarket in a big Indian city today and you’ll find a whole shelf of “functional drinks” promising better digestion, stronger immunity, and a happier gut. Kombucha in fancy bottles, kefir in the dairy aisle, prebiotic sodas with cheerful labels — and alongside them, the drinks Indian kitchens have made for generations: chaas, lassi, and kanji. So which of these functional drinks gut health claims are worth your money, and which are just marketing? Let’s compare kombucha, kefir, buttermilk, and prebiotic sodas on the four things that actually matter: sugar, live cultures, cost, and availability in India. There’s also a simple homemade buttermilk and kanji recipe, plus a label-reading guide so you can judge any bottle for yourself.
First, a quick definition. A functional drink is a drink marketed as doing more than quenching thirst — in this case, supporting gut health, usually by adding live microbes (probiotics) or fibre that feeds gut microbes (prebiotics). Some genuinely contain live cultures. Others contain so little of the active ingredient, or so much sugar, that the benefit is mostly on the label.
Kombucha: Fizzy, Trendy, and Often Sugary
Kombucha is tea — usually black or green tea — fermented with a culture of bacteria and yeast, often called a SCOBY. Fermentation produces a tangy, lightly fizzy drink with a small amount of alcohol, usually less than 0.5 percent.
Live cultures: Yes, kombucha contains live bacteria and yeast, though the exact strains and amounts vary a lot between brands and batches. Home-brewed kombucha is even more variable, and it can be contaminated if it is not made cleanly.
Sugar: This is the catch. Kombucha starts with a lot of sugar, and fermentation uses up only part of it. A typical bottled kombucha in India contains about 4 to 8 grams of sugar per 100 ml, so a 300 ml bottle can have 12 to 24 grams of sugar — similar to a small soft drink. Some brands are lower, around 2 to 3 grams per 100 ml, so the label matters more than the category.
Cost and availability: Kombucha is the most expensive drink on this list. In Indian cities, a 300 ml bottle typically costs ₹120 to ₹250. It’s easy to find in supermarkets and online in metros, but much harder to find in smaller towns.
Verdict: Kombucha can be a pleasant, lower-sugar alternative to a soft drink if you choose a low-sugar brand, but it is not a proven gut treatment — research on kombucha and human gut health is very limited. Pregnant women, young children, and people with weak immunity should be cautious with unpasteurised kombucha, and home brewing needs strict hygiene.
Kefir: The Strongest Live Cultures, at a Price
Kefir is fermented milk, traditionally made with kefir grains — clusters of bacteria and yeast. It tastes like a tangy, slightly fizzy version of thin curd, and it is one of the richest sources of live microbes among common foods, with many more strains than ordinary curd.
Live cultures: Kefir is the winner here. A good kefir can contain dozens of strains of bacteria and yeast, far more than curd or most probiotic drinks. Some small studies suggest kefir may support gut comfort and help after antibiotics, though the evidence is still early.
Sugar: Plain, unsweetened kefir is low in sugar — about 4 to 5 grams of natural milk sugar per 100 ml, similar to curd. Flavoured kefir, however, can have 8 to 12 grams of added sugar per 100 ml, which cancels out much of the benefit. Always choose plain.
Cost and availability: Kefir is becoming easier to find in Indian metros, where a 200 to 400 ml bottle typically costs ₹120 to ₹250. It’s still uncommon in smaller towns, and it needs refrigeration. You can also make it at home with kefir grains bought online, which brings the cost down sharply — but it needs daily attention.
Verdict: Plain kefir is one of the best functional drinks for live cultures, and it is worth trying if you can find it at a fair price and you enjoy the taste. But it is not essential — fresh curd gives you many of the same benefits at a fraction of the price, and no single drink will fix your gut on its own.
Chaas and Buttermilk: The Indian Original
Chaas, also called buttermilk, is the drink this whole category should be measured against. It’s made by churning curd with water, and it’s traditionally seasoned with roasted jeera, salt, curry leaves, ginger, or green chilli. It’s been part of Indian meals for centuries, long before the word “probiotic” existed.
Live cultures: Yes. Fresh chaas made from live curd contains the same beneficial bacteria as curd, including lactobacillus strains. It’s gentler on the stomach than milk, because much of the lactose has already been broken down by fermentation.
Sugar: Plain chaas has almost no added sugar — just the small amount of natural milk sugar in curd, about 3 to 4 grams per 100 ml, and often less because it is diluted with water. Sweetened lassi is a different drink, and it can be very high in sugar, so do not confuse the two.
Cost and availability: Chaas is by far the cheapest and most available drink on this list. A glass made at home costs a few rupees. Packaged chaas is sold across India for ₹10 to ₹30 a pack, though packaged versions are often pasteurised, which means the live cultures may be reduced or absent — check the label.
Verdict: For most Indian households, fresh homemade chaas is the best functional drink for gut health: it has live cultures, almost no sugar, it costs almost nothing, and it is available everywhere. It’s also light, cooling, and easy to digest, which is why it is traditionally served with lunch, especially in summer.
Prebiotic Sodas: Fibre in a Fizzy Can
Prebiotic sodas are the newest arrival. They are carbonated drinks with added soluble fibre — usually inulin from chicory root — marketed as feeding your gut bacteria. Some also add a little fruit juice and a little sugar or sweetener.
Live cultures: None, usually. Prebiotic sodas do not contain live microbes. Their claim is different: the fibre they contain feeds the microbes already in your gut. That is a reasonable idea in principle, but the amount matters.
Sugar: This varies widely. Some prebiotic sodas have 4 to 6 grams of sugar per 100 ml, which is lower than a regular soft drink but still meaningful. Others use sweeteners instead. Either way, read the label.
Cost and availability: In India, prebiotic sodas are still a niche product, mostly sold online and in premium stores in big cities, typically at ₹80 to ₹150 a can. That is a lot to pay for a few grams of fibre.
Verdict: A prebiotic soda can be a better choice than a regular soft drink, because it has less sugar and some fibre. But the fibre in one can — usually 3 to 6 grams — is less than you would get from a bowl of dal or a guava, and at many times the price. If you want more prebiotic fibre, eat more vegetables, dal, onions, garlic, bananas, and whole grains.
Functional Drinks Gut Health: How the Four Compare
| Drink | Live cultures | Sugar (per 100 ml) | Typical cost in India | Availability |
|---|---|---|---|---|
| Kombucha | Yes, variable | 4–8 g (check label) | ₹120–250 per 300 ml | Metros, online |
| Kefir (plain) | Yes, many strains | 4–5 g, natural | ₹120–250 per 200–400 ml | Metros, needs fridge |
| Chaas (fresh, homemade) | Yes, from live curd | Almost none added | A few rupees a glass | Everywhere |
| Prebiotic soda | No | 0–6 g (check label) | ₹80–150 a can | Online, premium stores |
The pattern is clear: the cheapest and most available drink is also one of the best. That’s not a coincidence — chaas became a daily habit in India precisely because it works, it is affordable, and it suits the climate.
Homemade Buttermilk and Kanji Recipes
Simple spiced chaas (makes 2 glasses)
- 1 cup fresh curd (not sour)
- 2 cups cool water
- 1/2 teaspoon roasted jeera powder
- A pinch of black salt or regular salt
- A few torn curry leaves and a small piece of grated ginger (optional)
Whisk the curd until smooth, add the water, and whisk again until light and frothy. Stir in the jeera powder, salt, ginger, and curry leaves. Serve cool. It takes five minutes, costs almost nothing, and is best fresh, because the live cultures are at their liveliest soon after churning.
Quick beetroot and carrot kanji (makes about 1 litre, ready in 3–4 days)
Put 2 peeled carrots (or 1 carrot and 1 small beetroot), cut into sticks, in a clean glass jar with 1 tablespoon coarsely ground mustard seeds and 1 teaspoon salt, and pour in 1 litre of boiled, cooled water. Cover with muslin, keep in sunlight for 3 to 4 days, stirring daily with a clean spoon. When it tastes tangy, strain and drink a small glass a day. Keep in the fridge once ready and finish within a week; if it smells off or looks mouldy, throw it away.
A Label-Reading Guide for Any Functional Drink
Before you pay for a bottle that promises gut health, spend thirty seconds on the label:
- Check sugar first. Look for “sugars” per 100 ml. Under 5 grams is reasonable; over 8 grams means it is closer to a soft drink than a health drink. Remember to multiply by the bottle size.
- Look for “live cultures”. If the label does not mention live cultures, the drink probably does not have them, or they were killed by pasteurisation. “Contains probiotics” without strain names or counts is vague — treat it with scepticism.
- Check the ingredient list and storage. A short list — tea, sugar, culture for kombucha; milk, culture for kefir — is a good sign. Live drinks need refrigeration; a “probiotic” drink sitting on a warm shelf for months is unlikely to have many live cultures left.
And one more habit worth building: compare the bottle with what’s already in your kitchen. If a ₹200 drink gives you less than a glass of chaas or a bowl of curd, you’re paying for the bottle, not the benefit.
Frequently Asked Questions
Is chaas better than kombucha for gut health?
For most people in India, yes — and not just because it is cheaper. Fresh chaas has live cultures, almost no added sugar, and it is easy to drink every day. Kombucha has live cultures too, but it usually has more sugar, costs far more, and the evidence for its gut benefits in humans is very limited.
Can I drink kombucha every day?
A small glass of low-sugar kombucha a few times a week is fine for most healthy adults. Daily large amounts are not necessary and add up in sugar and cost. Pregnant women, young children, and people with weak immunity should ask their doctor first, and home-brewed kombucha needs strict hygiene.
Do prebiotic sodas really feed gut bacteria?
They contain fibre that gut bacteria can feed on, so the idea is sound. But one can gives you only a few grams of fibre, which you can get more cheaply from food. They are a better choice than a regular soft drink, but they are not a shortcut to gut health.
The Takeaway
Functional drinks can be a pleasant part of a gut-friendly routine, but they are not the foundation of one. Kombucha is fun and fizzy but often sugary and expensive. Kefir has the strongest live cultures but is pricey and hard to find outside big cities. Prebiotic sodas offer a little fibre at a premium price. And chaas — fresh, homemade, seasoned with jeera — beats them all on sugar, cost, availability, and tradition. Start there, read every label before you pay, and spend the money you save on good food instead.
Disclaimer: This article is general information only and is not medical advice. It does not diagnose or treat any condition. See a doctor for diagnosis or before starting a supplement or treatment, especially if you have persistent digestive symptoms, are pregnant, or have a weakened immune system.