For many, especially in the Indian subcontinent, the question of whether a product is 'curd' or 'yogurt' seems like a matter of simple semantics. However, the distinction is rooted in the method of preparation and the bacterial cultures used, which in turn affects the product's texture, taste, and nutritional profile. Amul Masti is a commercially produced dairy product, but to truly understand its classification, one must first grasp the fundamental differences between traditional curd and modern yogurt.
The Defining Differences: Curd vs. Yogurt
The most critical difference between curd and yogurt lies in the bacterial strains used and the control over the fermentation process.
Traditional Curd (Dahi)
- Preparation: Curd is typically made at home by fermenting milk using a natural starter culture, which is a small amount of leftover curd. The bacteria in this starter are a mixed, non-specific colony of lactic acid bacteria.
- Consistency: The texture and consistency of homemade curd can vary greatly depending on the quality of the starter culture, the milk used, and the ambient temperature.
- Flavor: The taste can range from mildly tangy to quite sour, again, depending on the conditions of fermentation.
- Bacterial Content: Contains a variety of lactic acid bacteria, but the specific strains and their probiotic benefits are not standardized.
Commercial Yogurt
- Preparation: Yogurt is produced commercially under controlled conditions, using specific, well-defined bacterial strains. The standard yogurt cultures are Lactobacillus bulgaricus and Streptococcus thermophilus.
- Consistency: The texture is consistently smooth, creamy, and uniform across batches due to the controlled production environment and specific cultures.
- Flavor: The flavor is uniformly tangy because of the specific, known bacterial strains. Yogurt also comes in a wide variety of flavored options.
- Bacterial Content: Contains standardized strains of bacteria, and many products are fortified with additional probiotic cultures for enhanced health benefits.
Is Amul Masti Curd or Yogurt?
Based on these criteria, Amul Masti is a commercially produced, pasteurized toned milk product fermented with an "active culture," which classifies it as a type of yogurt. Several key factors lead to this conclusion:
- Controlled Process: Amul Masti is manufactured by the Gujarat Cooperative Milk Marketing Federation Ltd, a commercial entity. Its production involves pasteurized milk and specific active cultures to ensure consistency in quality, texture, and taste. This is the hallmark of yogurt manufacturing.
- Standardized Ingredients: The ingredients list for Amul Masti Dahi includes "Pasteurised Toned Milk, Milk Solids, Active Culture". This active culture is a controlled set of bacteria, unlike the mixed, non-specific strains found in homemade curd.
- Branding and Marketing: Amul itself often refers to the product as both "curd" and "yogurt" in its marketing and product descriptions, acknowledging the interchangeable use of the term in India while confirming its industrial manufacturing process. Retailers like JioMart also categorize it as "curd (yogurt)".
The Probiotic Advantage: Amul Masti Dahi vs. Amul Probiotic Dahi
While Amul Masti is a commercially produced yogurt, it's important to distinguish it from Amul's explicit probiotic products, such as Amul Probiotic Dahi. A randomized controlled trial on Amul Probiotic Yogurt noted that it contains specific, added probiotic strains like L. acidophilus La5 and Bifidobacterium lactis Bb12, whereas standard Amul Masti yogurt does not have these fortified strains. The standard Amul Masti still contains beneficial bacteria from its active culture, but the probiotic benefits are less specified and potent than in a product specifically labeled as 'probiotic'.
Why the Confusion Persists
The confusion stems from a long-standing cultural and linguistic practice in India, where the term dahi (traditionally translating to curd) is used for all fermented milk products, whether homemade or commercial. Over time, as Western-style yogurts were introduced and commercial dahi became widespread, the English term "curd" became the standard translation for dahi, despite the product technically being yogurt. The key takeaway is that Amul Masti is a commercially manufactured yogurt, but is sold and widely known as curd in the Indian market.
| Feature | Traditional Indian Curd (Dahi) | Commercial Yogurt (Amul Masti) | 
|---|---|---|
| Preparation | Natural fermentation with a non-specific starter culture, often homemade. | Controlled fermentation with specific, active bacterial cultures, commercially produced. | 
| Bacterial Strains | Mixed and undefined strains of lactic acid bacteria. | Specific, standardized strains (Lactobacillus and Streptococcus species), though not necessarily fortified probiotics. | 
| Consistency | Varies widely; often looser texture. | Consistently smooth, creamy, and uniform. | 
| Flavor | Can vary; generally more tangy or sour. | Consistent tangy flavor due to controlled process. | 
| Probiotics | Contains beneficial bacteria, but specific benefits are not standardized. | Contains beneficial bacteria; probiotic versions have specific, quantified strains for health benefits. | 
| Lactose Content | Lowered lactose content, but may still affect lactose-intolerant individuals. | Lower lactose content due to efficient fermentation, especially in Greek-style variants. | 
Conclusion: The Correct Classification
In conclusion, while colloquially referred to and sold as curd, Amul Masti is, from a food science perspective, a commercially produced yogurt. Its fermentation process utilizes specific, active cultures under controlled conditions, ensuring a consistent product, which is the defining characteristic of yogurt. For the average consumer, the distinction may seem minor, but understanding the differences highlights why a commercial product like Amul Masti has a consistent taste and texture, unlike the variable homemade curd. Both products offer distinct health benefits, and the choice between them ultimately depends on an individual's preference for taste, texture, and specific nutritional goals. For those seeking more potent and standardized probiotic benefits, explicitly labeled probiotic yogurt variants are the better choice.