Why blaming the diet misses what was building for years

I understand why someone would look at the timeline and draw a straight line. You’ve been eating a standard diet for most of your life—maybe even a low-fat one, because that’s what you were told was heart-healthy. You decide to make a change. You go keto or carnivore, dramatically increasing your fat intake. Within weeks or months, you’re experiencing gallbladder pain, and an ultrasound reveals gallstones.

The conclusion feels obvious: the fat did this.

In my experience, that conclusion—while completely understandable—misses what was actually happening underneath for a long time before the dietary change ever entered the picture.

The correlation trap

From most people’s perspective, if you make one big sweeping change in your life and something happens close enough to it, it’s easy to associate the two. That’s not a failure of intelligence; it’s how human pattern recognition works. We’re wired to connect cause and effect through proximity. Event A happens, event B follows, therefore A caused B.

The problem is that gallstones don’t form overnight. They develop over months and years—a slow crystallization of cholesterol or bile salts that accumulates so gradually a person would never notice it happening unless they had the foresight to be tracking trends over a very long period of time. By the time a gallstone becomes symptomatic—large enough to obstruct a bile duct or irritate the gallbladder wall—the formation process has been underway for far longer than most people realize.

What the dietary change often does isn’t create the problem; it reveals it. When you increase dietary fat, you’re asking your gallbladder to contract more forcefully and more frequently to release bile. If stones have been quietly forming during years of low bile demand, that sudden increase in activity can mobilize stones that were sitting there asymptomatically. The diet didn’t build the stones; it moved them.

This isn’t a comfortable reframe for someone in pain, and I don’t say it to dismiss what they’re going through. Gallstone attacks are genuinely miserable. What I’m hoping to do is shift the question from “what caused this?” to “what was building before this?”—because the answer matters for understanding how to move forward.

No flow means build up

This is the piece that ties the whole picture together, and it’s the part most people were never told.

Your gallbladder stores and concentrates bile—a digestive fluid produced by the liver—and releases it in concentrated bursts when you eat fat. That contraction-and-release cycle is how bile stays fluid and functional. It’s designed to flow. When it flows regularly, the components stay dissolved and move through the system the way they’re supposed to.

When someone eats a low-fat diet for an extended period, the gallbladder doesn’t get the signal to contract as often or as forcefully. Bile sits. It stagnates. Over time, that stagnant bile can become thick, sludgy, and eventually begin to crystallize—forming the cholesterol-based stones that account for roughly 80% of gallstone cases in Western populations.

The irony is hard to overstate: the dietary pattern most commonly recommended for “heart health” and general wellness—low-fat eating—may actually be one of the contributing factors to gallstone formation by reducing the very bile flow that keeps the gallbladder functioning properly.

If keto or carnivore diets caused gallstones, you’d see it happening a lot more across the board. In reality, it’s a pretty rare occurrence within these communities, and it almost always follows a history that includes years of low-fat eating combined with other contributing factors. The diet didn’t cause the stones; the diet came after a long period of conditions that did.

The factors that actually contribute

Gallstone formation is rarely about one thing. It’s typically a convergence of factors that built up over time—and the more of these that are present in someone’s history, the higher the likelihood that stones were forming long before any dietary shift.

Prolonged low-fat dieting — As I described above, years of low dietary fat reduces gallbladder contraction frequency. Bile sits longer, concentrates excessively, and becomes prone to crystallization. This is particularly relevant for anyone who spent decades following conventional low-fat dietary advice.

Rapid weight loss — This one catches people off guard. Rapid weight loss—from any method, not just keto—increases cholesterol secretion into bile as the body mobilizes stored fat. The liver produces more cholesterol-saturated bile than the gallbladder can efficiently process, creating conditions favorable for stone formation. This is one of the reasons I emphasize a measured approach to weight loss; the body does better with a pace that allows its systems to adapt.

Metabolic dysfunction and insulin resistance — Insulin resistance affects bile composition and gallbladder motility. Higher circulating insulin is associated with increased cholesterol saturation of bile and decreased gallbladder emptying—essentially recreating the stagnation problem through a metabolic pathway rather than a dietary one. The metabolic dysfunction was there before the diet changed.

Hormonal factors — Estrogen increases cholesterol secretion into bile, which is one of the reasons gallstones are significantly more common in women—particularly during pregnancy, hormone replacement therapy, or oral contraceptive use. Progesterone slows gallbladder emptying, compounding the effect. The interplay between hormonal status and gallstone risk is well-documented in the research and shows up consistently in practice.

Genetic predisposition — Some people are simply more prone to forming gallstones based on their genetics. Certain populations have higher prevalence rates, and family history is a recognized risk factor. This doesn’t mean stones are inevitable; it means the threshold for other contributing factors to tip the balance is lower.

Obesity — Higher body weight is associated with increased cholesterol production and secretion into bile. This is related to but distinct from the insulin resistance factor; the two often coexist, but each contributes independently to the gallstone risk picture.

When I sit across from someone who’s developed gallstones after starting keto or carnivore, I typically dig into each of these areas. Almost every time, there’s a history—years of low-fat eating, a period of rapid weight loss, metabolic syndrome, hormonal factors, or some combination. The dietary change didn’t create the conditions; it arrived after the conditions had been building quietly for a long time.

The misunderstanding isn’t malicious

I want to be clear about something: blaming keto or carnivore for gallstones comes from a place of genuine misunderstanding, not bad intentions. When you’re in pain and looking for a cause, the most recent change you made is the most obvious suspect. That’s normal and reasonable.

What I’d encourage anyone in this situation to consider is the full timeline. What was the diet like for the years before the change? Was there a history of low-fat eating? Yo-yo dieting with periods of rapid weight loss? Metabolic markers that suggested insulin resistance? Hormonal factors at play? The answers to those questions usually tell a more complete story than the timing of the dietary shift alone.

Once you understand what was going on underneath—how certain things progress over long periods of time—the picture becomes more clear. The change to keto or carnivore didn’t build the stones; it asked the gallbladder to do a job it hadn’t been doing in a while, and the stones that were already there made themselves known.

What this means moving forward

For someone who’s experienced gallstones and is wondering whether to continue with a higher-fat dietary approach, the answer depends on the specifics of their situation—and it’s worth working through with a practitioner who understands both the dietary framework and the digestive physiology.

If the gallbladder is still intact and the stones were small enough to pass, supporting liver health and bile flow—through targeted supplements like ox bile, TUDCA, and betaine HCl—can help improve bile quality and gallbladder function over time. The goal is to get bile flowing well enough that the conditions that led to stone formation don’t persist.

If the gallbladder has been removed, that changes the practical approach—bile now drips continuously rather than being released in concentrated bursts with meals—but it doesn’t mean a higher-fat diet is off the table. I’ve written a full guide on navigating keto and carnivore after gallbladder removal that covers the supplement and dietary strategies for that situation specifically.

In either case, the presence of gallstones—past or present—isn’t a reason to return to low-fat eating. If anything, the research suggests that returning to a low-fat pattern recreates the very conditions that contributed to stone formation in the first place. The path forward is supporting the system’s ability to handle fat well, not avoiding fat and allowing bile to stagnate again.

The bigger picture

Gallstones sit inside a larger story about digestive health that I keep coming back to in my clinical work. The liver produces bile. I’ve written about why liver health is so often the first domino in a dedicated post. The gallbladder stores and releases it. The stomach produces acid. The pancreas produces enzymes. Every piece depends on every other piece, and when one function falls behind, the downstream effects ripple through the whole system.

Blaming a single dietary change for a problem that developed over years is understandable—but it misses the opportunity to address what was actually happening underneath. The body doesn’t break overnight, and it doesn’t heal overnight either; what it does respond to, consistently, is attention and support for the specific functions that fell behind.

I hope this reframes the conversation for anyone who’s been struggling with this question. The answer isn’t simple, and I think that’s actually the point—the body is more complex than a single cause-and-effect narrative can capture, and honoring that complexity is how we start making real progress.

Sources

  • Portincasa P, Di Ciaula A, Bonfrate L, et al. “Metabolic dysfunction-associated gallstone disease: expecting more from critical care manifestations.” Internal and Emergency Medicine, 2023. 10.1007/s11739-023-03355-z
  • de Bari O, Wang TY, Liu M, Portincasa P, Wang DQ. “Estrogen induces two distinct cholesterol crystallization pathways by activating ERα and GPR30 in female mice.” Journal of Lipid Research, 2015. 10.1194/jlr.M059121

Rance Edwards is a National Board Certified Health and Wellness Coach (NBC-HWC) with over 2,000 clinical hours of experience, specializing in chronic disease management and lifestyle medicine.

If you’ve experienced gallstones and you’re trying to figure out whether a higher-fat diet is still the right path for you, I’d love to help you work through it. Book a free discovery call—no pressure, just an honest look at where you are and what makes sense from here.