Take a look at this chart. Go ahead, I’ll wait.
In case you aren’t sure what you’re looking at, this is a chart that shows average annual consumption of various fats for the period of 1909 to 2009.
One thing that stands out is the fact that, since the beginning of the 1970s, vegetable fats (oils, shortening, and margarine) have increased significantly, and animal fats (butter and lard) have decreased also dramatically.
Now take a look at this chart.
Notice anything similar between the two charts?
How about this one, too.