My wife struggles with many issues related to weight/nutrition/gain/loss/etc. due to medical issues. It's incredibly triggering. I genuinely do my best, and for the most part feel i am very supportive.
Once in a great while i have to say, honey, i prefer you talk to your doctor about this, then just let me know how to help.
Its much better i admit my limits and come back to it when I'm stronger. 😊
All the best!