Hi sarahlou, I'm nearly a year post op from my bypass, after day 4 of my pre op milk diet I felt very ill . Spoke to the pre op assessment nurse and she said I did the right thing contacting her as not everyone can manage it. She emailed me a new diet which consisted of food. I'm not saying it's the same at your hospital I was at queen Alexandra Portsmouth. But don't struggle no harm in asking. Good luck xx