Hi,
If I was an infant of breat feeding age, I'd be worried. There MIGHT be a concern for vegetarians who eat American style but get most of their protein from soy.

Most people should just get a chuckle from it. Look, you rip apart a piece of freaking brocoli and you are going to find cancer causing poisons that the plant manufactured to defend itself.
Your body can handle it.

Let's approach the subject a little differently. Ever hear of a movie called Supersize Me? A guy eats nothing but McDonalds food for a month and his health detoriates horribly. The big risk factors are well known, overeating, saturated fats, drugs (alcohol being the Number One problem, no worries, Mate?).