I've just picked up the (probably bad) habit of chewing sugarless gum during work. I'm chewing 5 gum and the ingredient list includes Phenylketonurics: contains Phenylalanine. Is this aspartame? I'm going through about 7 pieces during a day at work. Is this good for a pink sway? Are there other gums that might be better? I heard that maybe gums that contain Xylitol might be better?