The report also discusses the environmental importance of food loss and food waste, and points out that measuring the environmental impacts of food choices is “complex and challenging”, depending on many factors.
See World Resources Institute researcher Richard Waite's Twitter thread for a discussion of which countries include environmental criteria in their dietary guidelines.
Read the full report, Canada’s Dietary Guidelines for Health Professionals and Policy Makers, here. Section 1 discusses environmental impacts. See also the Foodsource chapter What is a healthy sustainable eating pattern? The FCRN report Plates, pyramids and planet looks at the extent to which dietary guidelines worldwide incorporate sustainability.