I'll start this off by giving you a broad overview of how it's changed over the decades.
Of course, the Canadian population has changed and we've had to adjust accordingly. Different consumption patterns, a variety of foods from various cultural backgrounds, and availability all come into play as we look at how Canadians eat and as we provide the best possible advice.
In terms of the scientific evidence and how that has evolved, I'll ask Dr. Hutchinson to add to that.