I was cautioned by a dietician when I inquired about the keto diet for myself. She said that the keto diet stresses the kidneys quite a bit and with a j-pouch we are in a state of slight dehydration all the time due to the lack a colon. This also stresses our kidneys.
I tried it for about 2 weeks and didn’t like it. I am vegetarian and had a difficult time so gave up and went back to my normal diet. I have to admit however that the keto diet saved my cousin’s life (she has all her bits) and she is thriving on it.