True up to a point, but if you haven't eaten it yourself the baby can't suck it up. There are only a very few things it will actually take from your body (calcium is one, which is why you need lots extra if you don't want tooth/bone probs later). If you are only eating McDonalds for 9 months you are not likely to be providing your baby with a lot in the way of nutrients. I think it's worth making a few changes, without becoming obsessed by it all.