dietary guidelines

Why? Because nutrition recommendations are not static. First eggs are verboten, then they're ok, for example. Such changes will continue to occur since nutrition research keeps being updated.
Canada, like the United States, provides some dietary guidance for its citizens. And like in the U.S., not everyone north of the boarder is happy with the result, despite the fact that they're also experiencing a similar obesity epidemic. Maybe the angst stems from the "latest" Canadian Food Guide, which came out in 2007 and could use an update.
The new Dietary Guidelines for Americans have just been published, and there are some positive moves as well as some of the same-old recommendations that have yet to be shown to be effective. Dietary advice always brings a variety of dissent and assents, so we thought we'd add some of our own.
There has long been concern that dietary guidelines are increasingly political. A new analysis contends that the U.S. Congress was right to schedule a hearing with Obama administration officials to ask why only some scientific literature was included in the recent guidance.