Actor Abhishek Bachchan is said to be on a diet to look in shape for the shooting of a Abbas-Mastan's thriller.Instead of using body-building protiens or steroids, the actor has opted for natural supplements to get a good body.

A source close to the star revealed that Abhishek diets and works out to lose weight for the movie which demands a lot of action and stunts. The actor is said to have already lost four kilos.