I bet that's true. The US ones have tons of calories and fat and that delicious Dove chocolate, and that's what makes them taste so good. In the US you can get boxes of Mickey Bars at Walmart for not all that much money than one at the parks, but that would be dangerous for me as I would eat one a day till they are gone. I limit myself to a Mickey Bar as a special treat at a Disney park, For the US ones I love biting off an ear of one on Mainstreet USA.
Actually I stay away from sweets in general these days with two exceptions: Cake at birthdays and Mickey Bars at Disney parks.