Gustav Schlickeysen (September 9, 1843 – 1893) was a German naturopath and raw food advocate.

In 1875, Schlickeysen attacked meat-eating for causing militarism and a "roaming, savage and warlike life".

[1] He argued that Germans should embrace a fruit and grain diet, appropriate to their natural home in the forest.

[4] In 1877, Francis William Newman President of the Vegetarian Society criticized the book for condemning beans, lentils, honey, tea and all cooked foods.

[5] Newman considered Schlickeysen a "pernicious foe to our society" and the book fanatical.