Colin Farrell Fitenss and Weight Loss Colin Farrell Celebrity Diet and Workout. Eating healthy and working out only come into play when he needs to shape up for a role. Colin is not a big fan of going to the gym, or being too picky about what he eats. Want to know how he gets into such great shape before his movies? Keep reading to find out. Colin Farrell Diet Colin Farrell doesn’t diet, however if he has a acting role that requires a skinny look he will do it! He recently said “I lost weight because my role demanded it.” […]