Exercise may not be enough (NYT - Wellness)

After years (like about 13 now) of lap swimming, I seem to have mostly gotten beyond the urge to spend the rest of the day eating and sleeping. Now I just want to spend it sleeping. Seriously, though, I don't seem to have as much trouble with the post-swim hunger. I'd attribute that to swimming after lunch, but I've been on the same schedule for pretty much the whole 13 years. Maybe it's part of an overall slowing of the metabolism, and maybe it's that I'm too fit and the swim isn't enough of a workout any more (I should be doing more laps, but I only swim twice a week and pushing too far beyond a mile causes problems in my shoulders).