I've been eating once a day since May last year, I eat only at dinner time and eat what I want and quite a lot. I don't get hungry until about 4pm, but then I go and do exercise. It's helped a lot with alertness, thinking is much clearer during the day, and I've always done a lot of sport and been quite slim, but I've really cut up since doing this (I'm 40 now, no fat around my middle). It's had no negative effect on my exercise or energy levels, so I'm just going to continue. I'm not completely strict with it, if someone asks me for breakfast or lunch then I'll go, but otherwise I've been pretty consistent with it.