I am 5'9". I was 155 pounds pre-diet.
I plummeted to ghastly 127 pounds after a few months. Much of that loss is attributed to the diet, but I suspect that some of the weight loss was also caused by muscle atrophy since I couldn't really do much of anything.
Since then, my weight has been coming back gradually. Two plus years into the diet, I'm back at 142 pounds. Once I was able to exercise again, I was successful in putting some pounds back on. It's been slow and steady progress.
One of the things that helped me early on was switching to a high-fat diet. It was hard, but I definitely found spoons of coconut oil and nibbling on walnuts and macademia nuts (some people react to mac nuts, so watch out) helped to provide some extra sustenance.