Human beings have always had trouble keeping track of calories, especially while shopping at the supermarket. We tend to pick up all the products that contain more calorie intake than we should have and then rue about it later on.
Mobile phone companies have caught on to this human weakness and have now developed a feature that allows a mobile phone to read a bar code from a food item, then displaying the calorie count of that item.
It is like having a virtual conscience that keeps reminding you about the calories in each bag of chips that you lay your hand on, who knows, it might even work with some people.
Of course it will take some convincing for people to even buy such phones, who wants to lug an additional conscience around?