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Gallstones: Why Do They Form; Separating Myth from Science

  • Writer: Dr. Gaurav Singh
    Dr. Gaurav Singh
  • Oct 12, 2025
  • 3 min read

Updated: Nov 4, 2025


Gallstones are often surrounded by strange food-related myths. You may have heard things like:

  • “Eating too many seeds will turn them into gallstones.”

  • “Gallstones are just undigested chunks of greasy food fossilizing inside you.”


These ideas might make the gallbladder sound like a garden or a crime scene, but the truth is far simpler and rooted deeply in chemistry.



What Are Gallstones Really?


Gallstones form when chemicals in bile clump together, similar to how sugar crystals form in overly sweetened water. This process isn’t about your last meal being guilty or creating any “poisonous” stones—it’s pure chemistry happening inside your body.


A Timeline of Gallstone Myths


The story of gallstones goes back thousands of years—ancient Egyptians even had them 5,000 years ago! Over time, myths included ideas like:

  • Excessive anger causes gallstones (linked to “yellow bile” and moods).

  • Gallstones are a sign of wealth, supposedly because of rich foods.

  • Gallstones are a punishment for dietary sins.


Although diet affects many diseases, gallstones mainly form through various chemical imbalances rather than dietary “sins.” Let’s set those myths aside and understand the facts.


Types of Gallstones:


Cholesterol and Pigment Stones

Gallstones generally belong to two types:

  • Cholesterol Stones (most common)

  • Pigment Stones (black and brown)

Cholesterol Stones: The Most Common Culprits

Cholesterol stones form when the chemical balance of bile changes. Bile contains:

  • Bile acids (66%)

  • Phospholipids (20%)

  • Cholesterol (4%)

  • Bilirubin (a small pigment fraction)


Bile acids and phospholipids help dissolve cholesterol by forming tiny structures called micelles. But when there is too much cholesterol or too little bile acids/phospholipids, cholesterol starts to crystallize into stones—much like sugar saturating water and forming crystals.


Only about 20% of cholesterol in bile is newly made by the liver—the rest comes from liver reserves. A high-cholesterol diet can add to this, but the liver usually balances things well.


The Role of Mucin


The gallbladder secretes mucin, a gel-like protein that protects it but can also trap cholesterol crystals, helping them clump and grow into stones.


Gallbladder Dysfunction


When cholesterol builds up excessively, it can damage the gallbladder wall, weakening its ability to squeeze bile out. This causes bile to stagnate, promoting stone formation—like water sitting in an unused tank leading to deposits.


Intestinal and Genetic Factors


High cholesterol absorption from diet can increase bile cholesterol. Genetics also play a role—certain groups and families have a higher risk of gallstones.


Pigment Stones: Black and Brown


Pigment stones mainly consist of bilirubin, calcium, and mucin.

  • Black pigment stones occur in chronic hemolytic anemia (rapid red blood cell breakdown) and some liver or gut diseases.

  • Brown pigment stones form due to infections or blockages in bile ducts, especially in Asia where worms or bacteria may cause these stones.


Brown stones are softer, fragile, and often linked to infections and bile flow blockage.


Why Do Stones Form? It’s Simple Chemistry and Physics


When bile chemicals concentrate too much or don’t dissolve properly, stones develop. Blockages slow bile flow, and infections add to the problem—just like clogged pipes in a kitchen sink.


Busting Myths with Reality


People love to blame foods or habits for gallstones, sometimes weaving peculiar stories. But gallstones are the result of chemical imbalances and bile flow disturbances, nothing more mystical.


I remember a personal story—my aunt’s gallstone resembled Lord Ganesha (to her), and she took it as a divine gift! Meanwhile, I just hoped not to inherit such “blessings.”


Final Thoughts


Gallstones aren’t scary mysterious objects but scientific outcomes of bile chemistry in your body. Understanding them helps you make informed choices and avoid falling for myths.


For clear, trusted health information and myth-busting truths about the digestive system, keep following Gut Instincts.


Thanks for reading—let’s keep the conversation honest and the facts clear!

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