I'm betting after you have that first salad, you won't be craving them quite so much. Lettuce is not only nutritionally worthless, is will go right through you. Of course, if you are battling constipation that could be a good thing. Kale, arugula, and cabbage make a far healthier salad that will stick with you a little longer, are far more nutritional dense, and high enough in fiber to help keep you regular.