Prior to bariatric surgery it's important that you speak with a nutritionist, and discuss your current diet and changes that are necessary to be made, prior to and after surgery. For example, your nutritionist will meet with you and ensure that you're eating three meals a day, make sure your trying to avoid liquid calories. Making sure that you don't eat a lot of carbohydrates.
It's important to realize that weight loss surgery is just a tool. If you don't curtail your eating habits before surgery, chances are your not going to be successful, or you may lose the weight but then gain it back. In addition, if you don't change some of your behaviors prior to surgery, you can actually end up getting sick after the surgery. So it's important to meet with a nutritionist or even speak with your surgeon about your nutrition and your eating habits prior to surgery.
Another thing that will be addressed in the preoperative nutrition assessment is how quickly you eat. You need to make sure that you take time out of your day, preferably 30 minutes per meal to really slow down, chew your food well, because this is going to be particularly important after weight loss surgery. These are just a few things that your nutritionist will go over with you in your preoperative nutrition assessment.