What people call "normal" may never be right for you. It has been extremely difficult for me to maintain any weight loss, and I doubt that I will ever be able to go up to that 150 grams ideal ever again. It is better for me to just stay away from bread, but I can do a few cheat meals here and there without gaining. The idea that whole foods keeps weight off is a myth for many of us, so don't be fooled by people who insist that the myth is entirely true. Only you will be able to tell for yourself.
If I were you, I wouldn't horse around with Atkins, but go directly to a Rosedale or Bernstein diet, and go take a look at the Quilt thread, especially if you are still bingeing or wanting to eat lots of food even though you are mostly low carb.
What the nutritionist said about ketones is pretty much bunk, but I'll dig up a link or a vid for you on that. While it is true that it is not a good idea for people with kidney disease to eat tons of protein, your nutritionist is assuming that all low carb diets are high in protein, and that isn't true at all. Also, ketotic diets have been shown to improve function in some people with kidney disease.
"Should everyone eat a paleo diet?" by Lynda Frassetto, MD on Vimeo