For nearly two centuries, scurvy looked like a disease. It was a missing nutrient.
What this line claims
An analogy, and nothing more. Lind's trial was 1747. The deficiency idea was still contested in the early 1900s. The substance was isolated in 1928 and shown to cure scurvy in 1932 (Hemilä, University of Helsinki). The line says nothing about whether the endocannabinoid system needs a dietary nutrient: the authors' own Preprint 5 reports that no deficiency phenotype has been characterised.
A line travels without its footnotes, so the claim and its status are on this page. All lines in this thread.