After a photo of "The Eternals" star's buff body went viral, he shared his secret to becoming ripped on Thursday's show: "I have not had pizza or a doughnut in over a year. I've had no refined sugar in a year. I've had almost no carbs at all."
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Nanjiani's new eating habits were implemented while he was training for Marvel's "The Eternals," which comes into theaters Nov. 6, 2020.
In response, Kimmel surprised Nanjiani with a dessert mobile filled with delicious treats and Guillermo even brought him a pizza.
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At the end of the interview, Nanjiani took a bite of the pizza, ending his yearlong diet.
"Jimmy Kimmel Live!" airs weeknights on ABC and on the ABC app at 11:35 p.m.