Nutrasweet gives me headaches. I discovered that when the product came out some years ago. Haven't tried it since IBS attacked 7 years ago.My advice, though is to ditch pop in general. Only pure water can help your colon process fiber adequately, and for me high fructose corn syrup contained in most soft drinks is just plain out of the question!In fact, giving up HFCS is the #1 thing that reduced the cramping for me (and bloating a little).