Occupational hazard
You probably couldn't tell just by looking at me [roll eyes], but I have put on a few pounds since writing has become my occupation. This appears to be a natural development - an occupational hazard. I've noticed that the act of writing has peculiar effects on the human body. It makes one hungry without burning a great many calories and makes one tired without the benefit of exercise. This wasn't always the case. I recall that the use of manual typewriters years ago was superb aerobic exercise (particularly for the left arm that was forever slapping the carriage return lever). And, if you ever had to move your writing device, it could qualify as weight-training as well. Pushing the buttons on feather-light keyboards just doesn't have the same effect. I've heard of one "green" option that might help writers keep slim. It involves hooking an electrical generator up to a treadmill or stationary bike and then plugging a notebook PC into the generator....