What is the best diet for a person who had undergone cholecystectomy?

Lower in fat diet: The gallbladder is a bile storage sack which pumps/squeezes bile into the intestine to help digest(emulsify) fats. After removal, you have less bile available to digest fat, but after a few months your body/liver will adjust. So, after surgery, consume less fat, but all else should be fine. In general, we eat too much--so a healthy, balanced diet, and maybe smaller portions, is advised. Good luck.