Hold on there, Slim. That low-calorie lifestyle that's been all over the news recently comes with some caveats. First off, the relevant studies, which suggest that reducing calories 30 percent below normal can extend your life, have focused mainly on caged animals. And while there's reason to believe humans would see similar benefits, if your idea of fun is anything more vigorous than channel surfing, a typical low-calorie plan will leave you seriously underfueled. We're not advocating all-you-can-eat buffets; we're just saying we wouldn't want Nicole Richie belaying us. Naturally, what and when you eat is vitally important, especially during exercise. But if you want to maintain both your weight and your lifestyle, aim for these daily caloric targets.

IF YOU WEIGH:	160 lbs	180 lbs	200 lbs
AND YOU: Exercise for a couple of hours on Saturday (e.g. pickup basketball)	2,100 calories	2,350 calories	2,600 calories
Exercise for one hour three times a week	2,350 calories	2,600 calories	2,850 calories
Exercise for one hour five times a week	2,600 calories	2,850 calories	3,200 calories
Are Laird Hamilton	You haven't weighed this little since you started eighth grade.	You haven't weighed this little since you finished eighth grade.	You're getting skinny, bro. Chow down.