Oh, there are very many ways. In particular, Health Canada has....
For instance, anything with trans fat in it is unhealthy these days, particularly with regard to manufactured trans fat, not naturally produced. We know what constitutes junk food in terms of what proportion of the fat in the food is saturated.
So there are all sorts of measures. We know what they are. We know what the calorie counts are per serving. It's not from a lack of information that we can't define it.