The MIT Technology Review has a piece on a new product by GE that scans your dinner to count the calories:
GE researchers have a prototype device that directly measures the calories in your food. So far it only works on blended foods—the prototype requires a homogenous mixture to get an accurate reading. But they’re developing a version of the device that will determine the calories in a plate of food—say, a burrito, some chips, and guacamole—and send the information to your smartphone.
Matt Webster, the senior scientist in diagnostic imaging and biomedical technologies at GE Research who invented the calorie counter, says eventually the device might be incorporated into a microwave oven or some other kitchen appliance. Heat your food, and at the same time get a readout of the precise calorie count, without measuring out portions and consulting nutritional charts.