[1] Voegtlin's Master of Science thesis at Northwestern University was titled Evacuation of the Gall Bladder with Cholecystokinin as Studied by Duodenal Drainage.

[10][11] Voegtlin was the first to publish a book The Stone Age Diet, based on the supposed principles of Paleolithic nutrition, in 1975.

[12][13][14] Voegtlin argued that humans are predominately carnivorous and should eat an animal-based diet of fat and protein with a minimum of carbohydrate.

[15][16] In an appendix to the book, Voegtlin promoted a low-carbohydrate diet consisting of meat, eggs, fish, cooked fruits and vegetables, green beans, cheese and sour cream.

[4] Food historian Adrienne Rose Johnson has commented that "Paleo leaders today have largely disavowed Voegtlin for his white supremacist, eugenicist, and generally unpalatable politics.

"[12] Sylvia R. Karasua, a Clinical Professor of Psychiatry has noted that "Voegtlin believed humans were “strictly carnivorous” until 10,000 years ago, something we now know to be patently false.