Tom Hanks: Cast Away
Hanks usually weighs around 185 pounds, but for Cast away he went up to 230 to play a Fed Ex delivery man that gets stranded on an island. He then lost it all and then some to portray the affects of starving, ultimately settling at 172 pounds. Hanks said his doctor suspected he was losing weight by vomiting and was even tested for it - but in reality he just limited his diet to fiber-rich foods.
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