Why are Londoners replacing meals with shakes?

Supermarket shelves are now full of meal replacement shakes - whether to lose weight, gain muscle or just for convenience, there are brands and products to fit every requirement.

But they are not a new invention, with brands like Slim Fast and the Cambridge Diet having been around for decades.

So why are young Londoners turning to meal replacement shakes in favour of food-based meals.

Video by Jacob Evans