In reply to springfall2008:
Yes, I can imagine so as that has been my experience for most of my adult life. I think I've been a slave to carbohydrates without knowing it. Till I was around 30 I was below 11 stone in weight. I suspect I was about 11 and a half when I began climbing in my 30s. For most of the last 20 years I've been heavier than that and about a year and a half ago I became determined to lose weight and tried a new tack as being almost 13st rang alarm bells.
So I trained myself progressively over months to still do hill/cycling exercise but without any breakfast except for the fatty yoghourt. I'd have sarnies with me for a late breakfast and see how far I could get. Only a few outings and I could breakfast on top of a mountain, a couple more and it was after coming down and then after driving home. Result, same exercise, meal eliminated.
Now hunger doesn't make me feel weak as I react emotionally to it as a positive - a buzz from being able to defy it and knowing it is keeping my weight down as well as the idea that when I do eat it'll be all the m ore enjoyable through hunger.
I'm now at 12 stone, want to get down another half or so and find I'm more nimble on my feet, faster and on rock I'm more balanced and less strained in the arms. I was never a hard climber but at 60 I've done climbs this year that I last did in the 90s. The fear business seems to be part of the conquest of hunger, perhaps what Mr Spock was always on about!