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https://www.military.com/history/why-us-navy-operated-fleet-of-ice-cream-ships-during-world-war-ii.html
An older guy once told me (only somewhat joking I think) that the four major food groups were: caffiene, nicotine, alcohol and refined sugar.
(He said while drinking an Irish coffee and smoking a cigarette. LOL)
I've heard it as caffeine, nicotine, sugar and preservatives.