8) Christian Bale – The Machinist (2004)

Christian Bale's weight loss in The Machinist is one of the most extreme physical transformations made by any actor in Hollywood. A man who had severe insomnia, Bale limited his calorie intake drastically and relied solely on one apple and a can of tuna per day, which left him dreadfully underweight, weighing off around 63 pounds. Bale's love for the role was stretched to its limit by body and mind, but of course, at the most considerable cost to his overall health.
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Edited by Sangeeta Mathew