I'd find a different practice. I have an amazing team who understand the realities of living including having sugar in our coffee or tea. Every team has different rules and mine encouraged fibre and large amounts of vegetables during my two week post op diet (I'm now 3 weeks post op and down over 11kg). So sorry you've not had a good experience with this person and if you can, try and find a team that suits you better and is happy to hear your concerns