Answer:
Invention of the term is attributed to Michael Jacobson, director of the Center for Science in the Public Interest, who utilized it first in 1972. Albeit we orally consume insalubrious victuals for centuries most types of junk victuals appeared in 20th century as a result of mechanization, electricity and labor-preserving contrivances that were utilized for preparation of victuals. Term "junk victuals" was utilized for the first time in 1972 but it owes its popularity to a novelty musical composition "Junk Aliment Junkie" by Larry Groce that was popular in 1976.
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