We owe a lot to grainy carbs. Us humans wouldn't be where we are today if agriculture never emerged, producing staples like bread and rice all over the world. I don't think anyone should be saying that carbs are 'bad', but most of us here will believe that the quantity of grains and sugars found in supermarkets has reached absurd quantities. I was grocery shopping last night and was struck when I noticed that there are whole aisles that I would no longer grab any item from.
Finding foods with high energy yield is beneficial for every single animal that has ever existed including humans. In recent times we took it too far though. Most dishes eaten in the standard western diet are bursting at the seams with sugar and grainy carbs, and this is reflected in the insane statistical levels of obesity we've managed to achieve. There's something truly screwed up with the way we live, and experimenting with reducing grains and sugars is as good a place as any to begin experimenting with healthier living. Seems to be working for a large number of people.
The OP is quite provocatively worded, I'm wondering if the responses in this thread so far are what you were expecting Chrisf12?