what wassi what was -- what was going on, why does that chocolate chip cookie have that power over me? >> he first started to ask such questions as dean of yale's medical school and he got a group of colleagues together to figure it out. >> it's a major factor of the cardiovascular disease. >> and at the core is the weight. why was it so hard? that was the question. >> the answer says kessler is that for roughly 70 million people, their brains are wired in such a way that they are literally hooked on food. >> not because you're lazy or not self-disciplined. your brain is being activated. >> your brain has been hijacked by fat, sugar and salt on some level? >> that's exactly right. you get -- it could be the sight, the smell, just the location, the visual. >> we pulled together a panel of overeaters to help illuminate kessler's findings. those who obsess about food and have difficulty stopping. mary crean says she's been an overeater her entire life. >> i will be at the supermarket, oh, there's the candy. >> wendy wessler had gastric bypass, but can't stop fixating on food. >> oh, i ha

he wassie junk a junkie who died. it happens every day in the united states. >> to dr.libeck, toxicologist. emergency medical physician. thank you for being with us. doctor, in contrast to what attorney richard herman has just blurted out, i doubt very seriously that michael jackson is responsible for putting fresh track marks on his neck. that would be virtually impossible to do, to shoot yourself up in the neck. >> yeah. you know, shooting yourself in the neck, people who are drug abusers, they try to find any type of vein they can. when they stop, when they can't find any more veins, sometimes they'll just pop it underneath their skin. for someone to find a vein in their neck, it's not uncommon. i've seen it before. but that's a desperate, a desperate measure. >> extremely desperate. and, penny douglas, how would you explain the fact that there's a doctor living there that, according to reports, shows up in the evening and leaves every morning. i mean, that fits hand in glove with the theory that he would be out with an iv drip all night on diprivan. somebody was giv

i wassy a bar tend are in washington, on -- in the late '70s and through the '80s, and, mr. kersten is exactly correct, you do -- you can feel this difference in the paper. one night i was working on a busy saturday night, and received a $100 bill for a drink which at that time was $2.50. for, you know, just a mixed drink. and immediately i could tell, at that point, i had been tending bar for 7 years and worked in some of this most popular places in washington, and so, hand handled a lot of money and it is dark in the bar, late at night, at night, and a lot of distractions. but, you feel it immediately. and i sensed it and walk over to the guy that i was working with and asked him and he couldn't tell any difference and i'm, well, i think this is funny, and so, i looked around and the guy was gone and it turned out he had gone up to another area of the bar, that i worked in and there was yet another bar and the guys at that particular bar, ended up accepting three of them from the guy. >> wow! >> caller: and each time buying one drink, and getting $97.75 and i'm sure he lef