Re:U.S. Kids Are Getting Nearly 70% of Their Calories from '...
by JumpCrisscross on Tuesday August 10, 2021 @04:50PM
(#28134329)
That would still seem to cover the coagulants necessary to make tofu, the rennet used to make Gruyère or Parmigiano, or nitrates and nitrites for cured meats. I suppose "nor normally used as a typical ingredient" could be the turning point, but that does seem to acknowledge the question's complexity by, effectively, grandfathering in traditional additives.
(a) food additive means any substance not normally consumed as a food by itself and not normally used as a typical ingredient of the food, whether or not it has nutritive value, the intentional addition of which to food for a technological (including organoleptic) purpose in the manufacture, processing, preparation, treatment, packing, packaging, transport or holding of such food results, or may be reasonably expected to result, (directly or indirectly) in it or its by-products becoming a component of or otherwise affecting the characteristics of such foods. The term does not include contaminants, or substances added to food for maintaining or improving nutritional qualities, or sodium chloride;
http://www.fao.org/3/Y2770E/y2770e03.htm
The FAO has a standards body that will give you tons of detail to back up their papers.
http://www.fao.org/fao-who-codexalimentarius/en/