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Both these perceptions are wrong.
How the gallbladder works
To understand what happens when you have your gallbladder removed, it's important to understand the function of this "storage sack".
Gall or bile is produced in the liver and then stored in the gallbladder until it's required for digestion. At this point, the gallbladder releases gall into the digestive system (the small intestine) to help with the digestion of fats.
It is important to keep in mind that gall or bile is produced by the liver, which is not removed when you have your gallbladder removed. After your operation, bile production will continue as before. You will still be able to digest fatty foods after your gallbladder op and there is no reason why you will not be able to follow a normal diet, which contains some fats.
It is also important to remember that the gallbladder is just a sack-like structure which the body uses to store gall or bile. If this sack is removed, the liver goes on producing gall, but instead of storing it in the gallbladder, the gall is excreted directly into the digestive tract to do its work in helping you to absorb fats.
In most cases, the so-called biliary tract in the liver widens or dilates to form a "simulated pouch" for the temporary storage of bile.
So, physiologically, you really won't be different after your gallbladder op. Your liver will still produce bile. The bile will be poured into the digestive tract, where it will assist with the absorption of fats. It's even probable that your body will make a "new" storage pouch to store bile.
Why is there a risk of weight gain
Researchers at the Department of Surgery at the Waterford Regional Hospital in Ireland did a study to find out if removal of the gallbladder leads to weight gain or not.
The researchers followed up on 42 patients who had undergone simple laparoscopic removal of the gallbladder (key-hole procedure) and 42 patients who had undergone other operations for a period of 3 years.
Patients who had the gallbladder ops gained weight and increased their BMIs by an average of 1,8 kg/m2, and women were particularly susceptible. Patients who did regular exercise after their procedures were less likely to gain weight.
According to Dr Ali and his team, "Laparoscopic cholecystectomy (removal of the gallbladder using key-hole surgery) relieves symptomatic cholelithiasis (gallstones), but may facilitate postoperative gluttony."
What the doctor means is that patients who suffer from gallstones, and associated nausea and other debilitating symptoms, probably have been eating less in general, and less fat in particular, before their operations.
A low-fat intake to avoid the symptoms of gallstones would help the person to either lose weight, or keep their weight under control. Once the gallstones are removed and the unpleasant symptoms disappear, there's no longer a reason to limit fat intake, so they start eating fat again, often in large quantities, and this may cause them to gain weight.
It is therefore highly likely that people who start eating large quantities of fatty foods after their operations will gain weight, but this isn't an automatic result of the procedure. Instead, it's an indulgence in foods that are high in kilojoules.
How to prevent weight gain
It you've had a gallbladder operation, it's important not to start eating loads of fatty foods once your symptoms improve.
Stick to a balanced, low-fat diet that won't only prevent weight gain, but which will ensure that you don't develop raised blood fat levels, and associated heart disease, or certain types of cancer. Be as active as possible and do aerobic exercise on a daily basis for 30 minutes or longer.
From the above, it's clear that having a gallbladder operation doesn't have to be followed by a special diet for the rest of your life. However, you do need to make sure that you don't develop "postoperative gluttony",and that you follow a low-fat, balanced diet, as well as an exercise programme, to ensure that you don't gain weight afterwards.
