This substance's popularity declined in the 1990s because of the transfats within it.  
A 1946 speech calling for "the need of protecting the interest of the Canadian consumer" by W. D. Euler helped overturn a Canadian ban on this good.  Hippolyte Mege-Mouries was awarded a prize by Napoleon III for inventing this product.  Before peanuts were used to make this product, some manufacturers sold it with a packet of food coloring to avoid a 10 cents per pound tax on it.  In several US states, it was not legal to sell any versions of this good colored (*) yellow.  In the 1930s, production of this good in Europe was largely controlled by Unilever, which had devastating consequences on whale populations.  It was originally made from pressed beef fat.  This substance's popularity declined in the 1990s because of the transfats within it.  The original name for this good combined the Greek word for pearl with the prefix oleo.  It's typically made from soybean, cottonseed or corn oil.  For 10 points, name this butter substitute.
A 1946 speech calling for "the need of protecting the interest of the Canadian consumer" by W. D. Euler helped overturn a Canadian ban on this good.  
margarine [or oleomargarine; accept oleo before mentioned]