Just received my new copy of Mangoes and Curry Leaves and want to make Chapati. Have some atta in the cupboard but I know it's at least 4-5 years old. I don't see any critters in it. Any reason it will go off? Does it go rancid because it's whole wheat? I hate to go through the trouble of making chapati and then have them taste awful. On the other hand, it's a good 45-minute drive to get more atta, so that's not likely to happen for a bit.