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Eating low fat is the conventional advice...and studies indicate that does not work...

"How to get gallstones
If you eat low fat less bile is needed to digest your food. More bile thus stays in the gallbladder. Long enough, perhaps, for stones to form. It’s been shown that people who (instead of fat) eat more carbohydrates are at increased risk of gallstones.

It all sounds logical. And there is even better evidence. The risk of low fat diets have been tested at least three times:" See the studies in this good article:

https://www.dietdoctor.com/gallstones-and-low-carb


Dr. Westman explains Gallbladder disease
https://www.youtube.com/watch?v=uMKKnZnVc1k