Sort of surprising to see the main factor being dietary and only calling out some specific things but not others. No mention of hormones (or chemicals that act like them), toxins, etc as risks.
Would imagine pesticides, environmental pollutants, etc
Normally “toxin” refers to a natural poison produced by an animal or plant.
Some molds have toxic spores which have carcinogenic effects.
Reviewing the dictionary(1) it seems you are right. For some reason I was thinking that anything toxic could be considered a toxin. Apparently that's not the case