After someone has gallbladder surgery, there is very little that they have to change with their diet, although some may experience issues with their digestion. The gallbladder is not an essential organ for the digestive process, according to the U.K.'s National Health Service.
The gallbladder is used to store bile, an acid that the digestion system uses to break down food. When people get their gallbladders removed, the bile instead drips out directly from the liver. This means that people have the ability to go back to their normal diet after having their gallbladder removed, although many tend to start with smaller meals. Some people can have complications, though, such as indigestion, flatulence and diarrhea. If these symptoms are occurring, they should go speak to a doctor and possibly change their diet.
In general, some symptoms can be avoided by abstaining from caffeinated drinks like coffee and tea, avoiding spicy and fatty foods and adding more fiber to the diet. Fiber can be found in fruits, vegetables, whole grain rice, pastas and breads as well as seeds, nuts and oats. If dietary changes don't alleviate these complications, however, it is advised that they should speak with their general practitioner and tell them they're having trouble with their digestion.