The vast majority of Americans now shop online – buying everything from clothes to mattresses to houses. But they are still sticking with physical shops when it comes to grocery shopping – 42% of shoppers want to see, touch, and smell fresh produce before they buy it.

Everything Americans throw into their baskets and trolleys as they peruse the aisles of their local supermarket has built an industry that's worth over $600 billion. But who actually heads out to pick up the groceries and when they do it is changing. How are big chains and local mini-marts adapting?

Food delivery services such as Goldbely and FoodyDirect have enabled Americans to get authentic, local specialities like Philly cheesesteaks or Hawaiian poke sent to any location in the US overnight. But with it being an expensive indulgence, what makes them worth splashing out on?

Popularised by picture-perfect Instagrammers, the clean eating aesthetic isn't accessible to many – and neither are the stores that stock organic goods. But while Whole Foods has gained a reputation as the grocery chain for wealthy health freaks, its latest venture intends to change that.