Hillary Swank used to be a vegetarian, but she had to gorge on fish to prepare for her role of a female fighter in the movie 'Million Dollar Baby', which left her body riddled with mercury poisoning.
The double-Oscar winner, 36, needed a protein-packed diet to build up her strength during filming of the 2004 movie.
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After struggling to get her body back on track, Swank was forced to go back to her vegetarian diet.
"I put on 19 pounds of muscle: I was 29, I was a vegetarian and suddenly I was eating so much fish that I got elevated mercury problems," the Daily Star quoted her as telling You magazine.
"It plagued me for a couple of years after that movie. When I discovered that my health was suffering, I had to change my diet. So now I eat pork and beef."