Dieticians have a lot to answer for!! Mine would never say the same thing!
When I did the low carb, fat and Cals real food option of my pre op, I stuck to veg and lean protein like chicken. I have been a low carb addict in the past, and realised fruit wasn't gonna help me get into ketosis. And ketosis is great, as you have no hunger then
Your team need to give you some straight answers. It's a shame it's bank holiday