"... In the Aztec culture—unfortunately for the history of the Mexican diet—
amaranth also had religious significance. It was a favorite food of
Huitzilopochtli, the hummingbird-visaged God of War who, legend had it, led the Aztecs out of the country’s northern wastelands to become lords of central Mexico. Amaranth flowers are bright and sweet; hummingbirds love them.
Huitzilopochtli, like all the gods of old Mexico, also loved the taste of human blood. A regular diet of sacrifices sustained him and kept the world from falling into darkness.
Every year during Huitzilopochtli’s sacred month, which corresponds roughly with December,
Aztec families built little statues of the god in their homes out of puffed amaranth and honey. According to some accounts,
they also included blood from human sacrifices. At the end of the month, the statue was carved up and eaten. The people would take the god into them, like Catholics with the host.
To arriving Spanish priests, the practice looked like intolerable paganism. And while not every Mexican used amaranth this way, the Spanish took no chances. Everywhere they went in Mexico, the Spanish tried to eradicate worship of the old gods. Because the amaranth service seemed like a demon mass—and because the Spanish god preferred wheat—
the priests did everything possible to end the cultivation and consumption of amaranth....."
Amaranth: The Seeds That Time Forgot