Lillian Gish. La Boheme. 1926.
"According to Robert Osborne, host of Turner Classic Movies, Gish prepared for the death scene by not drinking or eating for three days. When Vidor saw her condition, he worried that it might be Gish’s death scene as well as Mimi’s. She also learned how to breathe without visible movement and visited hospitals to learn about stages of tuberculosis."
The more I read about her the more impressed I become.