Rob Lowe is looking fit as ever at 54 in shirtless gym snapshot

Anyone else suddenly feeling guilty about their carb intake?

Rob Lowe posted a sweat-glistened shirtless photo of himself at the gym this week, and at 54 years old, the actor is looking fit as ever.

Although part of his physique is genetic, as evidenced by Instagram photos of his sons, Lowe has consistently advocated for a healthy lifestyle. In addition to regular exercise, he sticks to the Atkins diet plan. (If you're feeling inspired, here's the beginner's guide on Amazon.)

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Rob Lowe on Instagram
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Rob Lowe on Instagram
Getting ready! Mental Samurai is TONIGHT 9/8 central on @foxtv
Celebrating my #birthday with a #workout and @johnnylowe Whatever your age, be your best! #men #results @profile4men
Comfy.
Me and the boys getting at it last weekend. #karaoke #rock
Golf buddies.
Bonding. #dad #son #ocean
Merry #Christmas from our #family to yours! May your be blessed in the New Year.
Nothing is possible without #family #hollywoodwalkoffame #happy
Home.
At the #Duke game with the birthday boy! Go Matthew. Go Blue Devils. #football
A boy and his (brother's) dog. #Man #BestFriend
The Lowe boys take Hawaii! No fish is safe, no wave is too gnarly. It's on.
Nothing better than having the #boys back home for #summer. Can't believe I got them off the couch for a hike!
#birthday #vegas 21 and done!!
Repping for The Sheriff. #superbowl
Break in the action on set today. #WildBill
Cheers to an awesome holiday! Can't wait to head home to the newest addition to our family - Young Jack! Show me how you brought your dad-game this holiday season for your kids using #DadLife! @CocaCocaLife #Sponsored
New year, same ugly faces 😏 #happynewyears
The Lowe boys in the wilds of Hawaii. #adventure
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"Getting ready!" he captioned the pic, adding a reminder to watch his new game show "Mental Samurai," which airs Tuesdays on FOX.

Lowe's high-protein, low-carb diet fuels him to "have the energy I need to get through twelve-hour days," he told AOL in 2018.

Although he takes his health seriously, he's also said that he can't pass up a slice of New York pizza — it's all about maintaining a system that's sustainable and ultimately makes you feel healthy and happy. For a treat that isn't "cheating," he likes Atkins' milk chocolate shakes.

"You have to think of it as a lifestyle, because diets come and go," he said.

RELATED: 30 low-carb recipes to try

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Good Eats: 30+ low-carb recipes
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Good Eats: 30+ low-carb recipes

Butter-Basted Rib Eye Steaks by Food & Wine

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Peel-and-Eat Grilled Shrimp with Harissa by Food & Wine

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Cauliflower Steaks with Herb Salsa Verde by Food & Wine

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Skinny Spinach Bacon Alfredo Spaghetti Squash Boats by The Skinny Fork | Amanda Plott

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Grilled Herb Shrimp Skewers by Chez Us | Denise Woodward and Lenny Ferreira

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Frittata With Pea Shoots and Bacon by Jelly Toast | Emily Caruso

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Food Cart-Style Chicken Salad with White Sauce by Skinny Taste

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Cauliflower Pizza Crust with Roasted Vegetables and Goat Cheese by Domesticate ME! | Serena Wolf

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Chicken Caesar Skewers by Food & Wine

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Baked Chicken Zucchini with Bacon by Julia's Album 

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Grilled Strip Steaks with Onion Wedges by Food & Wine

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Spicy Whole Roasted Cauliflower by PureWow

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Bacon Wrapped Shrimp with Cocktail Sauce by Food & Wine

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Buffalo Bacon Roasted Cauliflower by A Spicy Perspective 

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Jalapeño Popper "Nachos" by Skinnytaste

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Honey Balsamic Mustard Glazed Chicken by Chef Billy Parisi | Billy Parisi

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Celery Soup with Bacon Croutons by Food & Wine

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Garlic Butter Shrimp Scampi by Damn Delicious

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Cheesy Kale Prosciutto Brunch Melts with Eggs by The Woks of Life

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Creamy Garlic Butter Tuscan Shrimp by Cafe Delites

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Korean Chicken Kabobs by Damn Delicious 

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Smoked Bacon Wrapped Onion Rings with Sriracha Mayo Sauce by Grilling 24x7 | John Thomas

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Balsamic Braised Beef Brisket with Bacon and Mushroom by Own Your Kitchen | Anne Burrell

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Carrot Pea Soup with Pancetta, Basil & Mint by The Woks of Life | The Leung Family

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Barbecue Shrimp with Avocado Salad by Food & Wine

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Mini Quail Eggs in Prosciutto Nests by Martha Stewart

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Bacon Wrapped Cherry-Peppers by Food & Wine

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Turkey Lettuce Cups by Kitchen Daily Editors

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