I think what is being proposed in the Health Canada document is around the daily values, in three areas in particular. There are daily values for vitamins, etc., but these are daily values around saturated fat, sodium, and sugars. That rests upon an evidence base, in terms of when risk begins to increase for heart disease, type 2 diabetes, hypertension, etc., with those particular ingredients.
That also rests upon the assumption of a 2,000-calorie-per-day diet. That is for adult women, around 2,000 calories per day. For children it's significantly less than that. That's where you begin to get into nuances, and the more nuance you require of a consumer, the more fuzzy the messaging gets. There are definitions, daily values, and percentages: they're evidence based.