Sugar, chocolate, meat and cheese.
Dr. Neal Barnard, author of 'Breaking the Food Seduction', says food opiates aren't as strong as morphine, but strong enough to trigger cravings.
"These foods trigger the release within the brain of certain opiate compounds. Opiates are in the same category as morphine. Cutting a food habit is just like cutting a smoking habit. If you tease yourself day after day, it really becomes more of a problem," he says.
That's why it's hard to cut back because when you eat just a little, you really want more.
So, especially when it comes to sugar, he believes the best way to break the habit is to go cold turkey, rather than slowly cutting back.