India’s soda shelves have changed almost overnight. Coke and Pepsi now sell zero-sugar versions of their drinks at prices as low as 10 rupees. The move came after Reliance launched Campa Cola with its own budget zero-sugar option. Now, they are taking over in big cities and small towns alike.

But what looks like a health trend is really a business strategy.   

What is really inside those bottles? And what does it mean for consumers?

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