I have been on pre op diet for 7 days. My diet has been 3 protein shakes a day along with 2 low cal meals. I started liquid only on 1-23-11. On 1-22 I woke up with mouth sores and have never had them before. Has anyone else experienced this?

Sounds like an allergic reaction. I would switch to a different type of protein shake. Or even go with the no sugar carnation instant breakfast for a day or so. Call your doctor see what he/she says.

Talk to your doctor fersure!!