Dabbawallas or lunch box men are a part of everyday office life in Mumbai. Every year they get millions of meals from people's homes to their offices on time and with the kind of accuracy that's brought them worldwide fame and recognition.

Now India's big cities are diversifying and workplace culture is rapidly changing. So what impact are these changes having on traditional trades like that of the Dabbawalla and what are they doing to keep up with the times?

Nidhi Dutt finds out.