Rob Lowe sure is fit. But he still loves a cheat day.

The 61-year-old actor − known for roles like the whip-smart Sam Seaborn on "The West Wing" as well as the energetic Chris Traeger on "Parks and Recreation" − will be the first to tell you that healthy eating is essential for longevity. But so is balance.

Which is why when Lowe − an avid follower of the low-carb Atkins diet for decades and the diet's brand spokesperson since 2018 − has an occasional cheat day, all bets are off.

"When I really cheat, I go ham," the actor says on a Zoom call from the Santa Barbara, California studio where he hosts his podcast "Literally! With Rob Lowe." "It's hot chicken. When I'm in New York, it's my favorite pizza place. Or, if I'm in Philly, I'm getting a Philly cheese steak with a whiz on it. Maybe I'll get The Apple Pan in LA and get a slice of pie after my burger. I mean, I know how to throw down."

The actor's cheat days clearly haven't had much impact on his physique. Just two weeks ago, Lowe flaunted a shirtless photo of himself with his 29-year-old son John Lowe on Instagram. In the caption, he called the "self indulgent shirtless gym photos" a "Lowe family tradition."