I don't know of any cases where as a result of religious precepts a population have found themselves enjoying less food than they would have if they didn't follow this particular religion.
I love to start characters in a place where you think you know them. We can make all kinds of assumptions about them and think they have no redeeming qualities, but like everyone, they're complex.
That's because international Islamic religious fanatics have the same goal as the Axis fascists - the destruction of our way of life.