Originally appeared on E! Online

Sydney Sweeney is allowing fans to be voyeurs into her transformation journey.

The "Euphoria" star shared insight into how she gained roughly 30 pounds to portray real-life boxer Christy Martin in her new movie, "Christy" — and it included a diet heavily made up of fast food.

In two photos shared to her Instagram Story Nov. 10 , Sweeney wore two different costumes — a military uniform and a blue oversized T-shirt and jeans — while on set of the drama. In one of the snaps, she's eating an entire pizza pie herself, while in the other, she's enjoying a personal order from Chick-Fil-A.

Reflecting on her efforts to transform into the athlete, she wrote atop the shots, "Trying hard to keep your calories up lol."

However, a carb-intense diet isn't the o

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