Nargis, who herself shed weight by going on a special juice diet, made her co-star Illeana D'Cruz try the same for one of the scenes in the film.
"I had a great time shooting in Bangkok. While I was there I always wanted to try a juice cleanse. I have heard and researched great things about giving your body a break from regular or junk food, so I decided to try a six day juice cleanse. I lost three kilos in six days," Nargis said.
She also said that seeing her diet course, Illeana got curious whom she convinced to try it.
'Main Tera Hero', a contemporary commercial Bollywood entertainer, features Varun Dhawan, Nargis Fakhri and Illeana D'Cruz.
Produced by Ekta Kapoor's Balaji Motion Pictures, the film hits cinema houses on April 4.