We are the only thing in nature that "produces" food - every other species photosynthesises, hunts or grazes. We're the only species that can cook. Is cooking unnatural?
>made only with ingredients or processes endogenous to living organisms without human intervention
Where do you draw the line? Is wheat flour "unnatural" because we winnow off the chaff and grind the grains? Does a chicken leg become "unnatural" if you pluck it and skin it? Does milk become unnatural if you churn it into butter? Does butter become unnatural if you clarify it into ghee?
The whole distinction between "natural" and "unnatural" is meaningless in any practical sense. Either everything we do is "natural" because we're animals, or everything that we do that apes can't is "unnatural". Either only a raw food diet is natural, or everything is natural. There's no logical distinction between the complex chemistry we perform in our kitchens every day and the complex chemistry that occurs in industrial food production, just a vague squeamishness.