Currently, more than 1 billion adults are overweight - and at least 300 million of them are clinically obese. Current obesity levels range from below 5% in China, Japan, and certain African nations to over 75% in urban Samoa. However, even in relatively low-prevalence countries like China, the rate is almost 20% in some cities.Childhood obesity is already epidemic in some areas and on the rise in others. An estimated...