Why Does Liver Failure Affect the Brain?

Every Indian household has a curd rule passed down from someone’s grandmother, and half my patients ask me to confirm or deny one during their visit. 

Curd sits right at the intersection of tradition and everyday diet, and the myths around it come up in my clinic more often than you’d expect. 

I’m Dr. Bipin Vibhute, Liver and Multi-Organ Transplant Surgeon at Jupiter Hospital, Baner, Pune, and I want to go through the most common ones honestly, without dismissing tradition and without pretending every old belief is backed by evidence.

Key Takeaways

• Curd at night doesn’t cause colds or coughs in most healthy people, despite the popular belief
• Curd in moderation doesn’t cause weight gain on its own
• Slightly sour curd is safe, but visibly spoiled curd is not the same thing
• Buffalo and cow curd differ in richness, not in one being “unhealthy”
• Individual tolerance is real and different from a myth being scientifically true

Why Do We Have So Many Curd Myths in the First Place?

Most curd myths trace back to Ayurveda, which classifies curd as increasing Kapha dosha, a quality associated with coldness and heaviness in the body.

• These ideas developed over centuries of observation, long before modern food science existed, and many carry genuine practical wisdom even where the mechanism described doesn’t match current biology
• The problem isn’t that Ayurvedic guidance is wrong. It’s that some of it gets repeated as strict medical fact rather than the traditional framework it actually comes from
• I try to hold both views honestly with my patients rather than picking one side to sound more scientific

The Curd at Night Myth: Does It Really Cause Cold and Cough?

Patients ask me directly, often word for word: is it true curd causes cold and cough? The curd at night myth is probably the one I hear most often in clinic, and the honest answer is no, not for most healthy people.

• A widely cited 1990 study published in the American Review of Respiratory Disease tracked adults given a cold virus and found no real link between dairy intake and mucus production
• A later review, “Milk, Mucus and Myths,” published in Archives of Disease in Childhood in 2019, reached a similar conclusion
• That said, if you personally feel congested after dahi, that’s your own body’s response, and it’s worth respecting even if it isn’t a universal rule
• If you already have an active cold or cough, sticking to room-temperature curd rather than fridge-cold curd is a reasonable middle ground

Does Curd Cause Weight Gain?

No, plain curd in a normal portion doesn’t cause weight gain on its own.

• Weight gain comes down to total calorie intake and overall diet balance, not one specific food eaten at a specific time
• Curd actually has a reasonable protein content for its calorie count, which can support satiety rather than working against it
• The real culprit is often sweetened or flavored curd, or curd paired with high-calorie sides, not curd itself
• If you’re watching weight, plain unsweetened curd remains one of the easier foods to keep in your diet without much concern

Myth: Is Sour or Slightly Old Curd Always Harmful?

Not always. Slightly sour curd is a normal part of fermentation, not automatically a sign of spoilage.

• As curd sits, natural fermentation continues and it becomes progressively more sour, which is expected and generally still safe within a day or two
• What’s genuinely a concern is visible mold, a sharply unpleasant smell, or a slimy texture, which signal actual spoilage rather than normal aging
• If you’re unsure, trust your senses over the exact number of hours it’s been sitting out
• I’d still recommend refrigerating curd promptly and not stretching it much beyond two days, sour or not

Myth: Is Buffalo Curd Unhealthy Compared to Cow Curd?

No, neither is inherently unhealthy. They’re simply different in fat and protein content.

• Buffalo milk curd is thicker and richer, with more casein protein and fat
• Cow milk curd is lighter, with less fat, which some people with lactose sensitivity find easier to digest
• Neither is the “wrong” choice. It genuinely comes down to your digestion, calorie needs, and personal preference
• Patients managing fatty liver or weight concerns often do better with cow curd simply because of the lower fat content, not because buffalo curd is unsafe.
• If fatty liver is part of what you’re managing, my article on whether fatty liver can be reversed through treatment and lifestyle changes explains where a small dietary choice like this actually fits into the bigger treatment picture. 

Myth: Can You Never Heat Curd?

This one has some truth to it. Heating curd does kill the live probiotic cultures that make it beneficial. If you’d like the fuller nutritional breakdown of what curd actually offers when eaten the right way, see my article on curd’s nutritional information and health benefits. 

• If you’re eating curd specifically to support your gut microbiome, heating defeats that purpose
• Cooking with curd, as in a curry or marinade, is still fine nutritionally, you simply won’t get the probiotic benefit from that particular dish
• This isn’t a safety issue, just a benefit trade-off worth knowing about

Myth: Is Packaged Curd Always Unsafe?

No, that’s an overcorrection from recent headlines. Most FSSAI-compliant packaged curd from established brands is safe. If you’d like a fuller side-by-side on which type actually comes out ahead nutritionally, my companion article on packaged curd vs homemade curd and which is healthier goes into that comparison directly. 

• A viral social media comparison earlier this year raised concerns about certain pouch-packed curd formats, and the brand involved publicly stated its products meet FSSAI standards
• I’d treat that episode as a reason to check manufacturing dates and storage, not a reason to avoid packaged curd altogether
• Choosing well-refrigerated, reputable brands and consuming them within the labeled window remains a reasonably safe choice

If any of this is relevant to a liver condition you’re managing, whether fatty liver, cirrhosis, or recovery after a transplant, I’d suggest speaking with a liver doctor in Pune directly. You can reach our team at Jupiter Hospital, Baner, Pune, on +91-70530 70531, so your diet can be built around your actual reports rather than general myths. More on the liver care available in Pune here. 

What’s Actually True About Curd, Then?

Strip away the myths and what remains is fairly simple. Curd is a nutritious, probiotic-rich food that supports digestion and a balanced gut microbiome, and by extension eases some of the load on your liver. For more on this, I’ve written separately about the secret health benefits of curd, which covers a few benefits this myth-busting piece doesn’t have room for. 

Final Thoughts

Most curd myths carry a grain of practical wisdom, even where the science doesn’t fully back the reasoning behind them. The honest approach is to keep what genuinely works for your body, question what doesn’t hold up, and not treat either tradition or modern research as the only valid answer. Curd, eaten sensibly, remains one of the simpler foods you don’t need to overthink.

FAQs

Why do people say don’t eat curd at night?
This comes from Ayurvedic tradition, which associates curd with qualities believed to worsen congestion at night, though modern research hasn’t found a direct link for most healthy people.

Is buffalo curd bad for health?
No, it’s simply richer in fat and protein than cow curd, which makes it heavier rather than harmful.

Can you eat curd every day without side effects?
Yes, for most healthy adults, daily curd in a normal portion doesn’t cause side effects, though those with a true dairy allergy or specific digestive conditions should check with their doctor first.

Does curd help or worsen acidity?
Plain curd is generally soothing for mild acidity for most people, though severe or frequent acidity needs proper medical evaluation rather than a dietary fix.

Is it true you shouldn’t mix milk and curd?
This is a traditional food-combining belief without strong scientific backing, though some people do report digestive discomfort from the combination personally.

Does curd help with hair or skin, like people claim?
Curd applied topically is a home remedy tradition, and while it isn’t harmful, the internal health benefits of eating curd are better documented than the external skin or hair claims.

Can curd replace probiotic supplements?
It can contribute to gut health, but supplement-strength probiotics contain concentrated, specific strains that curd doesn’t fully replicate.

Is it a myth that curd is only good in summer?
Largely yes, curd can be part of a balanced diet year-round, though some people naturally prefer lighter, cooling foods in hot weather for comfort reasons.

Does curd cause bloating for everyone?
No, bloating from curd usually points to lactose sensitivity or eating an unusually large portion, not a universal reaction.

Is homemade curd always more myth-proof than packaged curd?
Not automatically. Homemade curd avoids additives, but its safety depends entirely on hygienic preparation, so neither format is inherently free of risk.