Hi! Without the gallbladder, the flow of bile to digest fats is constant vs episodic,ie with the ingestion of fat.Taking oxbile and/or beet root tabs with meals will allow you to handle fat without discomfort.I doubt that this is the reason for the weight gain. Check your morning temp. before you get out of bed for a few times with a basil thermometer. If temp is below 76.6,your thyroid is not working well. A thyroid support supplement may help,better to see a homeopath.