What are the views on this? I'm on a very low calorie diet (500 calories per day) and want to run as well. My energy levels are very high at present and I feel I could do it. I know it's not usually advised but I wouldn't be running too hard- three 30 mintue sessions a week. It would only be for a couple of months then I'll be building up to a normal, runner-friendly diet but I really want to gradually build up my running now... Thoughts?