Why is the world so fat?
What is the biggest factor in obesity?
The answer is the amount of calories consumed per day.
That is the number of calories that the average person burns each day, according to the Centers for Disease Control and Prevention.
But the CDC says obesity is more complicated than just the amount that a person eats.
Health and Nutrition: A Global Perspective by Andrew P. Shaffer, MD, is published by Oxford University Press, a division of Penguin Random House LLC.