Olivia Munn believes the secret to her weight loss is chomping on beef jerky.
The 36-year-old actress has claimed her weight kept fluctuating when she was shooting 'X-Men: Apocalypse', which saw her lose a "bunch of weight" as she worked out, but re-gain the pounds because she used to snack on protein bars.
However, the brunette beauty decided to swap her sugar-filled snacks and Greek yoghurt for the meat feast.
Speaking to E! News about her healthy eating regime, Olivia - who portrays Psylocke in the fantasy film franchise - said: "Two years when I was shooting 'X-Men' I lost a bunch of weight working out and doing martial arts and didn't even realize it.
"[I started] reaching for protein bars a lot because I thought that was being healthy.
"I love jerky first of all, but then I looked and it was a lot less sugar and carbs and it was super high in protein. It was a lot easier than carting around a Greek yogurt because that's what I was doing at the time.
"That's when I started levelling off my weight."
And the star believes the lean slithers of protein, which she has likened to "steak in a bag" helped her to cut the weight.
She added: "I was able to maintain it because it's so delicious. It's like steak in a bag."
Olivia has revealed as well as eating lean meats, she also practices Tae Kwon Do' to stay in shape, which is a sport she practiced during her younger days.
She said: "I did Tae Kwon Do growing up and started again for 'X-Men'. That's the one thing I've been doing."
However, the model doesn't enjoy spin classes, and prefers to do "a million squats" if there is a goal at the end to achieve.
She said: "People go crazy for it [SoulCycle] and I just can't do it. I have to do something where there's a goal. I'll do a million squats if it means I can learn to do this 360-degree kick."
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