I did this A Lot before my surgery. When I went in for my check in, 7 days before surgery, I had gained 15lbs and was at risk not having the surgery. I knuckled down and ate premiere protein as two meal replacements and a 380 or less lean cuisine for third meal. I lost 10lbs and had my surgery on time. It's just convincing yourself the surgery is more important than our favorite foods we may have to give up.