Curd (Perugu/Dahi): The Food Many Avoid — But Science Shows It May Be One of the Smartest Daily Choices
Curd, known as Perugu/Dahi in Telugu and hind, is one of the most common foods in Indian households. It is simple, affordable, and traditionally consumed with almost every meal. Yet in recent years, many people have started avoiding curd because of confusion.
Some say it causes cold. Some say it increases mucus. Others fear it leads to weight gain. Many people stop eating curd without fully understanding what it actually does inside the body.
The truth is more balanced and far more interesting.
Curd is not just fermented milk. It is a living food containing beneficial bacteria, proteins, minerals, and bioactive compounds that interact with the gut, immune system, metabolism, and even skin health.
What Exactly Is Curd (Perugu/Dahi)?
Curd is produced by fermenting milk using naturally occurring lactic acid bacteria, primarily Lactobacillus species. These bacteria convert lactose (milk sugar) into lactic acid.
This process thickens the milk, gives it a slightly sour taste, and most importantly, introduces beneficial microorganisms that support gut health.
Unlike plain milk, curd is partially digested by bacteria before we consume it. This makes it easier to digest for many people.
Fermentation is the same biological process used to prepare other healthy foods across cultures. Similar to how seeds like Sesame Seeds (Nuvvulu) become easier to absorb when roasted or soaked, milk becomes more digestible after fermentation into curd.
Nutritional Profile of Curd (Per 100g)
| Nutrient | Amount (Approx.) | Role in the Body |
|---|---|---|
| Calories | 60–100 kcal | Moderate energy |
| Protein | 3–4 g | Muscle repair & satiety |
| Fat | 3–5 g | Energy & hormone support |
| Calcium | 100–120 mg | Bone strength |
| Vitamin B12 | Present | Nerve & blood health |
| Probiotics | Live cultures | Gut microbiome balance |
Compared to milk, curd often becomes easier to digest due to the breakdown of lactose during fermentation.
How Curd Works Inside the Body
1. Gut Microbiome Support
The human gut contains trillions of bacteria. Not all bacteria are harmful. In fact, many are essential for digestion, immunity, and inflammation control.
Curd provides probiotic bacteria that help maintain microbial balance. A balanced gut microbiome supports:
- Better digestion
- Improved nutrient absorption
- Reduced bloating
- Stronger immune response
Interestingly, gut health influences far more than digestion. It affects metabolism, mood, and even skin clarity.
2. The Gut–Skin Connection
Many people notice that regular curd consumption improves their skin. This is not magic. It is biology.
Inflammation in the gut often reflects on the skin through acne, dullness, or irritation. When gut bacteria are balanced, systemic inflammation reduces. This can indirectly support clearer skin.
Unlike sugary desserts, which may worsen skin inflammation, plain curd is metabolically stable and does not spike blood sugar rapidly — similar to how low-glycemic fruits like strawberries behave differently from refined sugar.
Also read our Pomegranate blog for skin.
3. Blood Sugar Regulation
Curd has a low glycemic index. The presence of protein and fat slows down carbohydrate absorption.
For individuals managing blood sugar levels, plain curd (without added sugar) can be a safe inclusion in balanced meals.
In fact, pairing curd with high-fiber foods or whole grains may help reduce post-meal glucose spikes.
Does Curd Cause Cold or Mucus?
This is one of the most common myths.
Scientific research does not strongly support the idea that curd directly causes cold or increases mucus production in healthy individuals.
However, individuals with existing respiratory infections may feel temporary throat heaviness when consuming cold curd from the refrigerator.
The key factor is temperature, not the curd itself.
Room-temperature curd is generally well tolerated by most people.
Curd and Weight Management
Curd is not inherently fattening.
It contains protein, which increases satiety and helps control appetite. Protein-rich foods reduce unnecessary snacking.
Full-fat curd in moderation can support balanced hormone production, while low-fat curd may be suitable for calorie-conscious individuals.
Weight gain occurs due to overall calorie surplus — not because of curd alone.
Curd and Bone Health
Curd provides calcium along with phosphorus and protein, which together support bone density.
Unlike calcium supplements, food-based calcium comes with supportive nutrients that improve absorption.
Regular intake may help maintain bone strength over time.
Read our Cashew Nuts (Kaju) blog.
Homemade Curd vs Packaged Curd
Homemade Curd
- Fresh bacterial cultures
- No stabilizers
- Traditional fermentation
Packaged Curd
- Standardized bacteria strains
- Longer shelf life
- May contain stabilizers
Fresh homemade curd generally contains more active cultures if consumed within 24 hours.
How Much Curd Should You Eat?
- Healthy adults: 1 cup (150–200g) per day
- Diabetic individuals: ½–1 cup
- Children: ½ cup
Excessive consumption may cause bloating in sensitive individuals.
Who Should Eat Curd Regularly?
- People with digestive imbalance
- Those seeking natural probiotic foods
- Individuals aiming for better skin clarity
- People wanting balanced protein intake
Who Should Be Careful?
- People with lactose intolerance (though many tolerate curd better than milk)
- Individuals with confirmed dairy allergy
- Those with severe sinus sensitivity (monitor personal response)
Advantages of Curd
- Supports gut health
- Improves digestion
- Provides protein and calcium
- Low glycemic impact
- Affordable and accessible
Disadvantages of Curd
- Not suitable for dairy allergy
- May cause bloating in excess
- Flavored or sweetened versions increase sugar intake
Murali’s Thoughts
Curd is a reminder that not all simple foods are simple in effect. Many people avoid curd due to myths, while others consume sweetened versions thinking they are healthy.
The real power of curd lies in its simplicity — plain, fresh, balanced, and part of a wholesome diet.
Read our Strawberries blog.
Conclusion
Curd (Perugu) is not a miracle cure, nor is it harmful by default. It is a fermented, probiotic-rich food that supports digestion, metabolic stability, and possibly skin clarity when consumed appropriately.
Understanding how and when to consume curd makes the difference between confusion and clarity.
What About You?
Do you eat curd daily? Have you avoided it due to myths? Share your experience and observations.
Frequently Asked Questions
1. Can curd be eaten at night?
Yes, if tolerated. Room temperature is better.
2. Is curd good for skin?
Indirectly, through gut health support.
3. Can diabetics eat curd?
Yes, plain curd in moderate portions.
4. Is curd better than milk?
For many people, yes — easier digestion.
5. Does curd cause cold?
Not directly in healthy individuals.
6. How long should curd be fermented?
6–8 hours depending on climate.
Medical Disclaimer
This article is for educational purposes only and does not replace professional medical advice. Individual tolerance varies. Consult a healthcare provider for personalized guidance.

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