Appeal to nature
An appeal to nature is a rhetorical technique for presenting and proposing the argument that "a thing is good because it is 'natural', or bad because it is 'unnatural'.
When such a principle is applied as a rule of thumb, natural facts are presumed to provide reliable value judgments regarding what is good, barring evidence to the contrary, and likewise for unnatural facts providing reliable value judgments regarding what is bad.
Within a limited domain, treating a rule of thumb such as "all else being equal, you should generally try to eat natural foods" as if it is an exceptionless principle can sometimes involve a fallacy of accident.
"[4] Chemical Neurological The meaning and importance of various understandings and concepts of "nature" has been a persistent topic of discussion historically in both science and philosophy.
To Greeks this… represented a conscious probing and exploration into an area wherein, according to their whole tradition of thought, lay the true source for norms of conduct.
"[7] Some popular examples of the appeal to nature can be found on labels and advertisements for food, clothing, alternative herbal remedies, and many other areas.
Thus, Singer claims, the moral permissibility or impermissibility of eating meat must be assessed on its own merits, not by appealing to what is "natural".
