Curd vs Yogurt: 7 Differences (Science, FSSAI & Nutrition Compared)
Curd vs Yogurt — Is There Actually a Difference?
If you have ever Googled curd vs yogurt, you know the pattern. A dozen pages give a correct but useless answer. So here it is, plainly. Yes, there is a technical difference. No, it does not matter for almost any Indian home.
Curd is the dahi we set in every Indian kitchen. You add a spoon of yesterday’s curd to warm milk. Some homes use a green chilli or a few drops of lemon. The bacteria are wild ones, mostly Lactobacillus. They change from home to home and season to season. That is why your mother’s dahi tastes different from your neighbour’s. It is also why summer curd sets faster than winter curd.
Yogurt is made with two fixed lab cultures. They are Lactobacillus bulgaricus and Streptococcus thermophilus. These strains are added in set amounts. So the result is the same every time. Same taste, same texture.
India made 239.3 million tonnes of milk in 2023-24 (NDDB) Codex rule: yogurt needs at least 10 million live starter bacteria per gram
🔄 Updated September 2026 — what the rules and lab data actually say
- FSSAI defines the two in separate rules. Dahi is milk soured with any harmless lactic culture (reg. 2.1.4). Yoghurt must use L. bulgaricus and S. thermophilus, and the bacteria must stay “viable and abundant” (reg. 2.1.12). Source: FSSAI Food Products Standards Regulations (PDF).
- In January 2023 FSSAI dropped the word “curd” from the fermented-milk standard. On 30 March 2023 it clarified that brands may print “Curd (Dahi)”, “Curd (Thayir)”, “Curd (Perugu)” and so on. The name on the tub is not a quality signal. Source: FSSAI press release, 30 March 2023.
- The world food code, Codex CXS 243-2003, says yogurt starter bacteria must be alive till the best-before date: at least 10⁷ cfu per gram.
- Per USDA FoodData Central, plain whole-milk yogurt has 61 kcal, 3.47 g protein and 121 mg calcium per 100 g (FDC 171284). Plain nonfat Greek yogurt has 59 kcal, 10.2 g protein and 110 mg calcium (FDC 170894).
- The US FDA standard (21 CFR §131.200) defines yogurt as milk cultured with Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus, with not less than 3.25% milkfat, 8.25% milk-solids-not-fat, and a finished pH of 4.6 or lower.
- ISAPP defines probiotics as “live microorganisms that, when administered in adequate amounts, confer a health benefit”. It adds that different strains have different effects. So no curd or yogurt is an automatic health cure.
- Straining is why Greek yogurt out-scores plain dahi on protein. Dietitians at Medanta put curd at 3–4 g protein per 100 g and Greek yogurt at 8–10 g.
The Science — How Each Is Made
The basic process is the same. Bacteria turn lactose (milk sugar) into lactic acid. The acid makes the milk proteins set. That is what turns thin milk into thick, tangy curd or yogurt. The real difference is which bacteria do the work. And how well you control the heat.
| Parameter | Curd (Dahi) | Yogurt |
|---|---|---|
| Starter | Spoonful of previous batch, chilli, or lemon | Lab-isolated cultures (L. bulgaricus + S. thermophilus) |
| Bacteria | Wild Lactobacillus + other naturally occurring strains | Exactly 2 standardised strains |
| Temperature | Warm milk left in a warm spot (no precise control) | Held at a fixed warm temperature, about 40–45°C, for 4–8 hours |
| Consistency | Varies batch to batch — sometimes thick, sometimes runny | Uniform texture every time |
| Taste | Ranges from mild to very sour depending on time, temp, culture | Consistent mild tang |
| Setting time | 4–12 hours (unpredictable, depends on season) | 6–8 hours (controlled) |
| Probiotic diversity | Higher — multiple wild strains | Lower — limited to 2 standard strains |
What FSSAI Says
India’s food regulator, FSSAI, treats them as two products. Both sit in the Food Safety and Standards (Food Products Standards and Food Additives) Regulations, 2011.
- Dahi or curd (reg. 2.1.4): “the product obtained from pasteurised or boiled milk by souring, natural or otherwise, by a harmless lactic acid culture or other harmless bacterial culture.” Dahi may contain added cane sugar. It must keep the fat and solids of the milk it came from. No named strain is required.
- Yoghurt (reg. 2.1.12): “a coagulated product obtained from pasteurised or boiled milk … by lactic acid fermentation through the action of Lactobacillus bulgaricus and Streptococcus thermophilus.” Other cultures may be added if the label says so. “The microorganisms in the final product must be viable and abundant.”
Read both definitions yourself in the FSSAI regulations (PDF). The rule matters for packaged tubs. Most Indian brands print dahi or curd. Tubs that follow the two-strain recipe print yoghurt.
The 2023 label change. In January 2023, FSSAI removed the English word “curd” from the fermented-milk standard. Brands and consumers pushed back. On 30 March 2023, FSSAI said brands may print “Curd” with a regional name in brackets. The official press release gives the examples: “Curd (Dahi)”, “Curd (Mosaru)”, “Curd (Thayir)”, “Curd (Perugu)”.
So when a tub says “yoghurt”, read the culture list. If it names L. bulgaricus and S. thermophilus, it is the standard kind. If it just says “lactic cultures”, it is closer to the dahi you set at home. The world food code adds one more test. Codex CXS 243-2003 says the starter bacteria must be alive till the best-before date. The floor is 10⁷ cfu per gram.
FSSAI reg. 2.1.4 — defines “Dahi or Curd” FSSAI reg. 2.1.12 — defines “Yoghurt”
Nutritional Comparison — Is One Healthier?
This is where people expect a big difference. There is not one. Curd and yogurt start with the same milk. They go through the same fermentation. So their nutrition is almost the same. The numbers below are per 100 g.
| Nutrient (per 100 g) | Homemade Curd (full-fat)* | Plain Yogurt (whole milk, USDA) | Greek Yogurt (plain, nonfat, USDA) |
|---|---|---|---|
| Calories | about 60 kcal | 61 kcal | 59 kcal |
| Protein | 3–4 g | 3.47 g | 10.2 g |
| Fat | about 3 g (depends on the milk) | 3.25 g | 0.39 g |
| Calcium | about 120 mg | 121 mg | 110 mg |
| Vitamin B12 | about 0.4 µg | 0.37 µg | 0.75 µg |
| Probiotic strains | Many wild strains | 2 standard strains | 2 standard strains (whey strained off) |
| Lactose | Lower than milk | Lower than milk | Lowest (whey strained off) |
*Homemade curd is not in the USDA table. Set from the same full-fat milk, it lands close to plain whole-milk yogurt. Medanta dietitians put curd at 3–4 g protein per 100 g. USDA rows: FDC 171284 and 170894.
The one real difference is Greek yogurt. It is strained to remove the whey. That packs about three times the protein into each spoon. Some calcium leaves with the whey. So Greek yogurt is a protein trade, not a health upgrade. That is a fair swap for gym-goers. It is not “healthier” on its own. We compare the two in detail in Greek yogurt vs curd. For gram-by-gram numbers, see how much protein is in dahi.
You can strain your own dahi at home. A cloth over a bowl works. A fridge strainer with a fine steel mesh is tidier.
Homemade curd = many wild strains, no added sugar Greek yogurt = about 3x protein (10.2 g vs 3.47 g, USDA)
A quick note: This article shares general food and wellness information for Indian readers. It is not medical advice. Bodies differ. If you are pregnant, unwell, or managing a health condition, please ask your doctor before making changes.
Fresh, thick, probiotic-rich dahi — set the same way every time.
InstaCuppa Automatic Curd Maker — 1L, 304 Stainless Steel, auto 40–45°C — Rs 1,199 (out of stock online, September 2026)
See Product Page →What Indian Households Should Actually Care About
Here is the honest truth. The curd vs yogurt debate is about labels, not health. If you set dahi at home, you already eat a great fermented food. The name does not matter. These three things do:
1. Freshness
Curd set this morning is fresher than any tub from a shop. It has no preservatives and no added sugar. Codex and FSSAI only ask that the bacteria stay alive till the best-before date. Fresh curd never has to wait that long. This alone makes homemade the better choice.
2. Probiotic diversity
Your grandmother’s culture has many wild Lactobacillus strains. Shop yogurt has two. More kinds of bacteria may be good for the gut. But this is not proven for everyone. ISAPP says every probiotic effect depends on the exact strain. Read more in our probiotic yogurt guide.
3. Thickness and texture
Thick, well-set dahi is not just about taste. It shows the fermentation finished and the culture is healthy. Runny curd usually means the milk was not warm enough. Or the culture was weak. Or the time was too short. The fix is not a new label. It is better heat control.
How to Make the Best Curd at Home Every Time
The biggest thing that ruins homemade curd is heat. Not the milk. Not the age of your culture. Just heat. Curd bacteria work best in warm milk, about 40–45°C. In cool milk they slow down, and you get thin dahi. In very hot milk they die.
In Indian summers, curd sets fast but often turns sour. In winter it can take 10–12 hours and still come out thin. The room cools down overnight. The old fixes work some days: a blanket, the oven light, a spot near the stove. But they are not reliable. Our how to set curd at home guide has the season-by-season method.
The reliable method
- Boil 1 litre of full-fat milk (toned works too, but full-fat sets thicker).
- Let it cool to about 40–45°C. Warm to the touch, not hot.
- Add 1–2 teaspoons of previous curd as starter. Mix gently.
- Keep it at 40–45°C for 6–8 hours. Do not disturb it.
- Refrigerate once set.
Step 4 is where most people struggle. Holding 40–45°C for 6–8 hours is easy in a lab. It is hard in a kitchen. Unless something does it for you.
Bias disclosure: We sell the product below. Weigh this tip with that in mind. The facts on heat and fermentation are science. The product pick is ours.
The InstaCuppa Automatic Curd Maker (Rs 1,199) has a 1-litre 304 stainless steel inner pot. A small heater holds the milk at about 40–45°C for 6–8 hours. You add warm milk with starter, close the lid, and plug it in. No blankets. No checking at 2 AM. It works the same in summer and winter. Stock note (September 2026): it is out of stock on our store right now. The product page shows restock updates.
| Method | Temperature Control | Effort | Consistency |
|---|---|---|---|
| Blanket method | None — depends on ambient temp | Low but unpredictable | Varies by season |
| Oven with light on | Warm, but not controlled | Moderate — oven unavailable for cooking | Decent in winter, too hot in summer |
| Multicooker yogurt mode | Good (fixed warm setting) | Low, but ties up a big appliance | Consistent |
| Automatic curd maker | 40–45°C (auto-held) | Lowest — set and forget | Consistent year-round |
Frequently Asked Questions
1. Is curd and yogurt the same thing?
Technically, no. Curd (dahi) uses wild, natural bacteria. Yogurt uses two fixed cultures, L. bulgaricus and S. thermophilus. In Indian homes the two words are used for the same thing. The nutrition and taste are nearly the same.
2. Which is healthier — curd or yogurt?
For daily eating, homemade curd is the better pick for most families. It is fresh, has no added sugar, and has many kinds of bacteria. Packaged yogurt is consistent but has only two strains. Calories, protein and calcium are nearly the same. USDA lists 61 kcal and 3.47 g protein per 100 g for plain yogurt.
3. Is Greek yogurt better than regular curd?
Greek yogurt has about three times the protein. USDA lists 10.2 g per 100 g for plain nonfat Greek yogurt, against 3.47 g for plain yogurt. It is strained, so some calcium leaves with the whey. Pick Greek yogurt for protein. Pick homemade curd for freshness and variety of bacteria.
4. Why does my homemade curd turn out watery in winter?
Curd bacteria like warm milk, about 40–45°C. Winter rooms get cold overnight, so the bacteria slow down. Keep the pot warm. Wrap it in a towel, use a warm oven with the light on, or use an automatic curd maker that holds the heat.
5. Can lactose-intolerant people eat curd?
Many can. The bacteria eat some of the lactose and turn it into lactic acid. Their own lactase enzyme also keeps working in your gut. A 2014 review in the American Journal of Clinical Nutrition found this lets many lactose-intolerant people eat yogurt without symptoms. Curd is not lactose-free. Start with small amounts and see how you feel.
6. How long does homemade curd stay fresh?
In the fridge, homemade curd stays fresh for 3–5 days. After that it turns more sour. The bacteria keep working slowly, even when cold. Sour curd is still safe. Use it for chaas, kadhi or marinades. It is past its best for eating plain or in raita.
7. Does yogurt mean curd?
In everyday Indian English, yes. Yogurt is the common English word for dahi. On a label, the words mean different things. FSSAI calls milk soured with any harmless culture “dahi or curd”. It calls the two-strain product “yoghurt”. Since March 2023, brands may print “Curd (Dahi)” or a regional name like “Curd (Thayir)”.
8. Which is better for gut health, curd or yogurt?
Both carry live bacteria. Homemade curd has more kinds of them. Packaged yogurt has two named strains in a known amount. ISAPP says the benefit depends on the exact strain, not the name on the tub. Eat either one fresh and often. Neither is a medicine.
Stop guessing. Set thick dahi every time — summer or winter.
InstaCuppa Automatic Curd Maker — 1L, 304 SS, 40–45°C auto temp — Rs 1,199 (out of stock online right now)
See Product Page →
InstaCuppa Automatic Curd Maker Machine — 1L, 304 Steel, auto 40–45°C
Out of stock online (September 2026). Restock updates on the product page.
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- FSSAI — Food Safety and Standards (Food Products Standards and Food Additives) Regulations, 2011 (PDF) — reg. 2.1.4 “Dahi or Curd” and reg. 2.1.12 “Yoghurt” (fermented milk products)
- FSSAI press release, 30 March 2023 — omission of the term “curd” by notification dated 11 January 2023, and the clarification allowing “Curd (Dahi)”, “Curd (Mosaru)”, “Curd (Thayir)”, “Curd (Perugu)”
- Codex Alimentarius — Standard for Fermented Milks CXS 243-2003 (PDF) — starter microorganisms viable to the date of minimum durability; minimum 10⁷ cfu/g
- USDA FoodData Central — Yogurt, plain, whole milk (FDC 171284) — 61 kcal, 3.47 g protein, 3.25 g fat, 121 mg calcium, 0.37 µg B12 per 100 g
- USDA FoodData Central — Yogurt, Greek, plain, nonfat (FDC 170894) — 59 kcal, 10.2 g protein, 0.39 g fat, 110 mg calcium, 0.75 µg B12 per 100 g
- National Dairy Development Board — Milk production in India — 239.3 million tonnes in 2023-24 (Basic Animal Husbandry Statistics, DAHD)
- ISAPP — Probiotics — FAO/WHO definition; “different strains have different effects”
- Savaiano DA (2014). Lactose digestion from yogurt: mechanism and relevance. American Journal of Clinical Nutrition — bacterial lactase in yogurt digests lactose enough to prevent symptoms in lactose-intolerant people
- NIDDK — Lactose intolerance: definition and facts
- Marco ML et al. (2017). Health benefits of fermented foods: microbiota and beyond. Current Opinion in Biotechnology, 44, 94–102
- Fisberg M, Machado R (2015). History of yogurt and current patterns of consumption. Nutrition Reviews, 73(suppl 1), 4–7
- US FDA — Standard of Identity for Yogurt, 21 CFR §131.200
- Medanta — Difference between yoghurt and curd — curd ~3–4 g protein per 100 g vs Greek yogurt ~8–10 g
- InstaCuppa Automatic Curd Maker — product page — 304 stainless steel 1-litre inner pot, auto temperature about 40–45°C, 6–8 hours; price and stock checked 8 September 2026
Saran Reddy is the founder of InstaCuppa, a home and kitchen appliance brand focused on tea, coffee, and kitchen essentials for Indian households. He grew up eating his grandmother’s thick-set dahi with rice and has strong opinions about curd temperature. He has never once called it yogurt at home.
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