[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1507475/pdf/bmjcred00690-0047.pdf The discovery that spinach was as valuable a source of iron as red meat was made in the 1890s, and it proved a useful propaganda weapon for the meatless days of the second world war. A statue of Popeye in Crystal City, Texas, c] ncbi.nlm.nih.gov