Electrodes are used to simulate the taste and feel of real food in the mouth.
[1] In 2012, Dr. Nimesha Ranasinghe and a team of researchers at the National University of Singapore developed the digital lollipop, an electronic device capable of transmitting four major taste sensations (salty, sour, sweet and bitter) to the tongue.
[2] In 2016 the same team created a square with thermoelectric elements to simulate the sensation of sweetness through changes in temperature.
If this system is implemented in mugs or drinking glasses, it could make low-sugar drinks taste sweeter helping people reduce sugar intake.
A team from the University of Tokyo created a device that simulates the different textures of food through electricity.