I guess cows aren't into the four food groups, especially when they are two of them.

This quip plays on the “four food groups” framework and the irony of applying human dietary categories to an animal’s perspective. Cows, stereotypically associated with both meat (beef) and dairy (milk), are humorously imagined as disinterested in a system that effectively turns them into menu items. The joke hinges on anthropomorphism—granting cows a viewpoint—and on the double meaning of “into” (interested in vs. included in). Beneath the punchline is a light satirical jab at how casually humans classify foods while overlooking the living sources behind them.