I have found therapy can be a great place to learn how to communicate wants and needs clearly. Sometimes it has been surprising to me how much you have to spell out something in real life and in therapy. Ts can't read your mind or know what works for you unless you tell them. It may or may not be experience but the point is, you have to communicate what you want or need. Just because you've had a conversation about it before and it led to a rupture, doesn't mean she understands the best way to help you.

You don't have to be all confrontational about it. You can open up the conversation by saying that you've been thinking about how best to work on the "real issues" and you want to discuss how to discuss them. You can say "it doesn't help me when you give me dieting tips", but sometimes it helps to just say you want to talk about talking about it and that has been helpful for me in the past.