Compare and contrast Canada’s Food Guides at 1944 (it was called Food Rules then) and 1992
The biggest difference is that the 1992 version visually demonstrated that the base, or largest component, of a nutritionally balanced meal should be based on “Grain Products”.
Whereas the 1944 version listed the necessary foods without placing undue importance on grains.
The 1944 version also emphasized eating toast with butter! And of the importance of eating eggs and liver several times a week.
Note the recommendation to take fish oil for children and expectant mothers. I recall people over 60 talking about taking cod liver oil as children. Not only was it important for developing strong bones but it’s considered excellent brain food as well. Quite crucial for people who don’t live in sunny countries.
You don’t see a fear of fat in the 1944 version. And that was because this guide was developed before Ancel Keys came out with his “lipid hypothesis” that linked heart diseases to high cholesterol brought on by saturated fat. His famous study “Seven countries” was found to be cherry-picked to support his data, i.e Ancel Keys deliberately rejected data from countries that did not support his hypothesis. Later on, when researchers reproduced the study from all 22 countries (not just the 7 Keys focused on) they found there was no correlation between saturated fat and heart disease. The low-fat hysteria that many are starting to blame for the current obesity crisis was predicated on bad science.
The United States was the foremost leader in all sorts of scientific endeavours that it wasn’t a surprised its neighbour to the north got influenced by its nutritional policies. Canada also suffers from an obesity crisis although less so than the US. One of four people here is obese whereas in the States its one in three.
Eating according the 1944 food guide would do a lot to help with satiety and ensure people are eating nutrient dense foods.