PET brain scans show chemical differences in t...

PET brain scans show chemical differences in the brain between addicts and non-addicts. The normal images in the bottom row come from non-addicts; the abnormal images in the top row come from patients with addiction disorders. These PET brain scans show that that addicts have fewer than average dopamine receptors in their brains, so that weaker dopamine signals are sent between cells. (Photo credit: Wikipedia)

The Associated Press ran an article on a new study that looks at brain scans to determine why we are addicted to sugar and how it may be causing obesity. Our brains have an epigenetic trigger that rewards us for eating (pleasure). This trigger is not implemented when sugar is present. Thus we continue to eat causing weight gain.