Our national weight gain is not, as many people assume, because we are far less active; studies have found little difference in energy expended now than in the 1950s. It is because we are eating far, far more calories than ever before, in the form of soda, junk food, sweets, fat and salt laden meals, and huge portions. We have become addicted to food, and that addiction starts in very early childhood.
Kessler lays out how sugar, fat and salt stimulates the reward centers of the brain in much the same way as cigarettes, alcohol and illicit drugs.
Put down that donut and read the rest of the article here.