Marginal Revolution says (inter alia):
">>The idea that the FDA can regulate and control what individuals may learn about their own bodies is deeply offensive and, in my view, plainly unconstitutional.>>"
A commenter asks: "It might be offensive, but unconstitutional? What provision of the constitution does this violate?"
I'd suggest the first amendment, interpreted as freedom of speech. 23andme can tell you whatever they choose about yourself, and you are free to hear it.