I mean from a straightforward point of view you can understand the rise on a worldly basis just because of the progression of women's rights around the globe--but when you look at Canada what's changed since the late 70's to the point where women are taking in increased sugars?
A lot has changed Canada since the late 1970s, which is why I say you'd need more information than just that little map or even stats of the kind I got off statscan. You could probably come up with a half-dozen stories why that fit the map data, but that wouldn't mean they were right.