In our typical western diets, we derive a high percentage of our energy derived from carbohydrates. It’s not the only option, and not necessarily the healthiest either. Unfortunately a high carb diet also tends to have adverse affects, and is known to contribute to gall bladder disease.
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A healthy gall bladder must contract regularly and you need fat in the diet to stimulate the gall bladder to contract.
Gall stones can form when the gall bladder is not stimulated because there’s not enough fat in the diet.
The problem is, if you have gall stones because of your previously high carbohydrate diet and then you convert to a lower carbohydrate alternative diet (think Banting, Keto, HFLC etc), the gall bladder is suddenly going to wake up, start contracting and potentially start ejecting those gall stones.
If you’re just starting out on a higher fat lifestyle, please understand the new diet didn’t cause the gall stones, it just causes the gall stones to be ejected into the biliary tree which can then cause the obstruction.