Green’s Dictionary of Slang

nut ’n’ berry n.

[the preference for vegetarianism associated with the hippie n.2 (3) and early conservationists]

(US campus) a latter-day hippie.

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[US]Eble Sl. and Sociability 44: Granola triggers an association with other kinds of health foods, which in turn inspire alternate forms for indicating ‘someone who identifies with the styles and concerns of the 1960s’: granola-groid, crunchy granola, crunchy, grape nut, nut-n-berry, rice-and-beaner, earth biscuit, and earth muffin.