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As Tony leaves a message for Pepper Potts, he looks like he has lost a significant amount of weight. Robert Downey Jr. didn't really
lose weight for the movie's opening scenes.
"Our VFX team did an exceptional job of taking some weight off of him and making him look like he is on death's door," said Joe Russo.
"The intent here was to make you believe, if momentarily, that we may actually kill Tony Stark at the beginning of the film," he added.