John Goodman Credits Mediterranean Diet for Dramatic Slim Down

John Goodman in November 2014 (left) and at the 'Trumbo' premiere in October 2015. (Photo: Getty Images)

At one point weighing close to 400 pounds, John Goodman is happy to be sporting a much slimmer and healthier body these days. The 63-year-old star, who can be seen in the highly anticipated "10 Cloverfield Land," has dealt with weight fluctuations for many years. Back in 2010, after losing 100 pounds, he told People that he had given up alcohol, cut sugar from his diet, and was hitting the gym six days a week.

"I know it sounds sappy, but it was a waste," he said of his previous lifestyle. "It takes a lot of creative energy to sit on your ass and figure out what you're going to eat next ... I wanted to live life better."

Last November, fitness guru Mackie Shilstone told the New York Post that Goodman's transformation "didn’t happen overnight and has "been an ongoing process." In addition to time on the treadmill and elliptical machine, plus a commitment to walking 10,000-12,000 steps daily, the actor has also embraced a Mediterranean-style eating plan, says Shilstone.

“The Mediterranean diet includes foods and beverages native to the land for which it’s named," Martina Cartwright, a registered dietitian, told MNN. "Rich in fruits, veggies, whole grains, nuts, beans, legumes, a variety of herbs and spices, wine, fish, seafood and olive oil, this meal plan may reduce the risk of heart disease and other inflammatory conditions like arthritis.”

Besides the immediate health benefits, research has shown that the Mediterranean diet may also have an impact on our genes, with the potential to add years to a person's life.

For Goodman, developing a total wellness plan and adhering to it religiously made all the difference, his personal trainer says.

“There needs to be strategic planning,” Shilstone said. “This time, he really wanted to do it.”

Check out a trailer for Goodman's next film, "10 Cloverfield Lane," below: