1000 calories a week seems a little bit low, but I'll admit that's just anecdotal - I'll do about 1kcal in a single 10 kilometre run. In terms of fitness and g

1000 calories a week seems a little bit low, but I'll admit that's just anecdotal - I'll do about 1kcal in a single 10 kilometre run. In terms of fitness and general health, I notice a big difference if I'm getting regular (ie. most days of the week, allowing for 1 or 2 rest days) exercise of about half an hour, and at least one longer run/ride/whatever, out to about an hour or so. Take any excuse to do things the hard way when you're exercising - push up hills, do sprints, to intervals etc, and you'll notice an amazing difference. Only downside to all this exercise is that you really need your 8 hours of sleep a night to recover.