Gaining too much weight is becoming a common global problem for adults and children. The WHO says that at least 20 million children under the age of five are also considered overweight

There has been a global shift in dietary habits towards calorie rich foods, as well as a universal decrease in exercise. By and large,  the world's population is getting fat. Losing that weight is not as easy as it is to put on. But VOA's Melinda Smith has more on a recent study that uses a simple tool to help those who need to lose weight.