What foods/meals can I eat if I have sludge buildup in my gallbladder?

Avoid Fat food. You can eat almost anything you desire, but you must 1). Avoid fatty and greasy food. 2). Avoid diets high in cholesterol. 3). Keep yourself well hydrated. Maintain normal weight. When you begin to have symptoms , please talk to your pcp for surgical evaluation to remove the gallbladder.
Low fat diet. Try to maintain a low fat diet so the gallbladder doesn't have to work too hard. Avoid red meats, eggs, desserts, cheese and other foods containing high fat.
Avoid fried foods. Sludge is basically minute stones caused by due inflamation in the gall bladder , fatty food fried food , cause gall bladder to contract , so you have o avoid them , as much as possible .