Well it's still early days, but I'm already feeling the effects of low carb. I bumped into a friend the other day who I have not seen since before Christmas. She told me I was looking good, and mentioned I seemed to have a lot more energy. She also said she had got used to seeing dark circles under my eyes, and she was pleased to see they had disappeared. I had not mentioned the low carb diet to her, so the effects must be palpable!
I teach the piano, and walk to most of my pupils. One of them lives over an hour's walk away, with a very large steep hill to negotiate. For over a year I have found that hill a real struggle (Being 26, 5' 11" and 11 stone 6 I should be able to manage it fine). The last couple of lessons I have almost flown up it. The added protein in my diet really seems to be giving me the energy I need to get through the day. Previously I would feel too lethargic to get up at a reasonable time. Now on my day off I have been up since 7, made breakfast for my wife and I (Cheese and bacon omelette, tasty!) sorted my accounts for the last month, and made plans for some low carb dessert attempts.
I have definitely not perfected low carb yet, and am still getting a couple of highs and lows here and there. However, they are much smaller highs, and the lows are much rarer. I will take any medical test results I get into consideration, but while I feel this healthy, I can't think of a reason to go back!
Thanks to everyone for the comments, learning from your experiences is helping me to get on the right track.