- If researchers don't include India and China in their worldwide trophic level calculation, the average global human trophic level has actually stayed pretty steady around 2.3 over the past 50 years.
- The trophic levels of the fish people eat has fallen, from 2.88 in 1961 to 2.69 in 2009. That's because fisheries around the world have been catching fewer big predator fish, in part because of overfishing.
- The countries with the highest trophic levels in the world include Mongolia, Mauritania, Iceland and the Scandinavian nations, all of which have traditional diets based on meat, fish, or dairy, and few vegetables. However, their trophic levels have fallen since 1961. In Scandinavia, government agencies launched campaigns to get people to eat more veggies. Meanwhile, in Mongolia and Mauritania, people are eating less traditional diets now as a result of modernization and urbanization.