The movie - which received its UK premiere in London last night (March 14) - has been reduced to a 12A rating in the UK and a PG-13 in the US.
Lawrence explained that she understood the decision as a large fanbase for the original books by Suzanne Collins are youngsters.
"We had to have a PG-13 rating but violence is at the heart of the movie, because it has to make people angry enough to start an uprising," she told BBC Breakfast.
"We couldn't water down the movie. The PG-13 rating helped us, because it made the violence really quick [on screen]."
Speaking about her character Katniss Everdeen, she said: "She's a lot braver than she thinks she is. She's an interesting hero, she never actually thinks she won't die."
When asked about appearing in a possible trilogy of films playing a teenager, she added: "I think so, I hope so. I'll try and stay away from cigarettes."
Jennifer Lawrence recently joked that her training regime for the film has helped her with her fear of spiders.
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View pictures from The Hunger Games European premiere below: