3D food printing has been a main component of food innovation during the last two decades but now its commercial virtues have been enhanced through accessible prices, marketing and social media. Scientists in MIT Media Lab have experimented on transforming 2D food into 3D food during the cooking process thus creating a process of 4D food printing. They managed to obtain significant results which have been described in their paper (Transformative Appetite: Shape-Changing Food Transforms from 2D to 3D by Water Interaction through Cooking CHI 2017). The 2D food mentioned regards edible food strips that pop into different 3D shapes through a self-folding process triggered by water absorption. Its main benefit is the packaging volume needs (since it can be flatly-packed) and the respective cost are reduced. You can learn more about the innovation of 3D food printing here.
A brief presentation is available here: