I was looking up information about the connection between Popeye's strength and spinach, and it turns out that it was all based on a 19th century typo:
The myth of the Popeye Effect dates back to a real scientific mistake. In 1870, Dr E von Wolf mistakenly misplaced a decimal point and wrongly estimated the iron content of spinach to be 10 times more than any other green vegetable. The mistake was corrected only in 1937. But by then it was too late. The first Popeye cartoons appeared in 1929 - and the spinach-muscles-strength legend was already born.
Popeye is one of my all time favorite cartoon characters. I too liked spinach because of him. Just think where the spinach industry would be without him.