"While Canada’s obesity rates have, for the most part, been based on self-reported data, the United States has derived rates from actual measurements of height and weight since the early 1960s. With the directly measured data from the 2004 CCHS, it is possible to compare the prevalence of obesity in the two countries."
So Canadians don't lie about their weight? Not even for a drivers license? What a nice group of honest people.