If you want to check out more about PrescriptFit, their website is a great resource www.drdiet.com They have products that can be used for both pre and post op. The site also has a video testimonial from a bariatric surgeon. They offer shakes, soups and puddings that are fortified with amino acids that help decrease sugar and starch cravings and also help to increase satiety (feeling of being full). The protein used is egg, which is a higher quality protein than whey or soy (plus it tastes better than whey). You can order online or from clinics that carry the products.