Green’s Dictionary of Slang

granola n.

[the supposedly healthy US cereal Crunchy Granola]

(US campus) a natural-looking person who pursues a healthy lifestyle; an environmentalist; used derog. to indicate one who pursues a ‘Sixties’ lifestyle; also as adj.

[US]Eble Campus Sl. Fall 3: granola – one who typically eats health foods.
[US]P. Munro Sl. U. 97: Stephanie turned into a granola [...] She won’t even eat at McDonald’s.
[US]Da Bomb 🌐 13: Granola: A typical nature-oriented person; someone whose interests include the natural environment, the outdoors, and activities such as camping, mountain biking, rock climbing, etc.
[US]C. Eble (ed.) UNC-CH Campus Sl. Spring 2014 Fall 3: GRANOLA — concerned with protecting the environment: ‘She is so granola she uses cloth diapers for her baby’.

In compounds

granola dyke (n.) (also crunch granola dyke, earthy-crunchy dyke) [dyke n.]

(US gay) a lesbian who pursues a ‘Sixties’ lifestyle; also attrib.

[US]R. Scott Rebecca’s Dict. of Queer Sl. 🌐 earthy-crunchy dyke — a lesbian who is usually vegetarian and usually either New Age or Neopagan and has a tendency to change her name to something like ‘Sparrow’ or ‘Lavender Crystal Power.’ Earth-mother type, wears Birkenstocks (unless she’s too vegetarian to wear leather), varies from extremely flaky to very-nice-and-sensible-but-who-eats-too-much-tofu-with-bean-sprouts-for-most-people.
D. Reuben Everything You Aways Wanted to Know About Sex 179: A ‘Granola Dyke’ is a natural-organic-ecology oriented lesbian, often well-respected by other lesbians.
[US]N. Johnson ‘Any Way You Need Her’ 🎵 Now if for you to see the light, she’s got to be a crunch granola dyke, Birkenstocks and all, I know the lord will come.
Tyler & Bussel Caught Looking 112: Some of my friends laughed when granola-dyke me started dating a police officer, saying it was an obvious case of opposites attracting.
granola head (n.) (also granola breath, granola groid) [-head sfx (1)]

(US) a person who pursues an all-natural lifestyle; also attrib.

[US]A. Heckerling Clueless [film script] Hey, granola breath, you got something on your chin.
[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.
[US]C. Hiaasen Sick Puppy 142: Granola-head bunny lovers.
[US]C. Hiaasen Skinny Dip 91: The infernal granola-head environmentalists had been correct all along.