Dwayne “The Rock” Johnson is known for transforming into muscle-bound heroes for the big screen and he is once again putting the same effort into his first superhero film ‘Black Adam’.

The actor, who has turned 49 today, is following a strict food regime for his much-anticipated role, says his dietitian Georgie Fear.

“Leading up to the movie shoot, The Rock is weighing out everything he eats to maintain a very strict diet,” she said in a recent Instagram post.

“It’s rarely called for,” she told Insider. “It’s a pain in the butt and he’s doing it for a temporary period of time.”

According to her, keeping track of what you eat, and leaving room for treats can be good advice, but non-movie stars can skip some of the intensive extra steps, like chugging mountains of protein.

“It can be helpful, though, to occasionally measure out food to give yourself a better sense of what one portion looks like. This can help you more accurately assess what you eat, even if you usually just eyeball it. The technique can be particularly helpful for calorie-dense food or condiments like peanut butter, butter, and cooking oils where a small amount adds up quickly,” she said, reports Insider.com.

The Rock’s cheat meals are legendary, from a mountain of sushi to a stack of large pizzas.

“I think it’s important to include treats that we can include just for fun, I like that we’re not expecting people to be machines,” Fear said.

However, she doesn’t love the term “cheat meal.” That kind of framing implies a sense of guilt or shame around enjoying foods, and it can trigger cycles of excessive restriction and binge eating.

“Framing it as a cheat meal can be problematic. I often hear clients say that they’re eating like a car whose brakes have failed,” she said.

Instead, plan to regularly incorporate favorite foods, regardless of nutritional value, as about 10% of your daily calories. For most people, that’s about one treat a day, such as a glass of wine, a small donut, that you enjoy guilt-free.

That’s a more sustainable approach for most people than waiting for one day a week and then diving into a platter of fully-loaded burgers or a few pizzas in one meal.

She also said that one part of The Rock’s routine one shouldn’t emulate is his meager sleep schedule — he routinely posts about going to bed after midnight, only to wake up a few hours later for a dawn gym session.

“Sleeping only five to six hours would definitely make it harder to make progress. Getting closer to seven or eight hours helps manage appetite and keep your stress low,” Fear said.