My understanding of this is that it's just a 'frivolous lawsuit' situation being pursued by an activist group called, rather misleadingly, the 'Center for Science in the Public Interest' (CSPI). They're threatening to sue McDonalds over providing free toys to kids given away as part of the 'happy meal'.
The lawsuit threat is a trick used by quite a few activist groups in the USA. There is a chance with some image-conscious organisations that they will back down and do what CSPI want, but this is probably unlikely with McD. The publicity that CSPI get from threatening the lawsuit also helps with their subscriber funding.
This link from the Activist Cash website gives some details of CSPI and their history:
Calories out are basically all burned. If you are pooing or peeing out more than single-digit percentages of extractable calories in, you need a doctor.
I agree with JWB's surmise (in one of the books?) that Hamburgers are fundamentally rather nutritious items and that the green objection is basically the old socialism thing. I prefer BK over McD, (better meat, more salad), but both institutions have nearly perfected the art of delivering cheap food of quality acceptable to the customer in the most efficient way possible (i.e. with the least possible waste).
At some point, some of these greens might realise that their aims and those of "big business" are essentially the same - efficiency.
I don't suppose regular chip eating is sensible from those of a sedentary lifestyle.