Actress Katrina Kaif says she keeps altering her diet and fitness plans according to the demand of the roles she essays on screen.

"My diet and fitness mantra depends on what I want to achieve, whatever role or the desired result is. So, whether you want to look little more toned or want a more athletic look, you want to look very thin for a role, or you want just look normal like a soft woman who does not want too much of definition, I change the plan accordingly," Katrina said here.

She said she shuffles between Pilates or functional training. "I pretty much try to follow a sensible way of eating and just do the things we all get to know are good for us."

The 'Raajneeti' actress spoke at the book launch of fitness professionals Yasmin Karachiwala and Zeena Dhalla's co-authored book, "Sculpt and Shape: The Pilates Way", which guides readers on how to change the shape of their body by learning more about their posture and how improving it can change the way they look.