Technically anything with calories 'breaks a fast'. But the benefits of using the KPOW products, as Kam has even said, outweighs the minor benefits you receive from truly fasting. While Kam fasts, she supplements with the KPOW products so even though it's a minor amount of calories she's consuming it's more like a 'small break in fast'.  Also, if you're fasting for a health benefit, then stick to water and black coffee only. However, if it's to manage caloric intake, then having a drink that’s less than 50 calories is perfectly fine. Most people are fasting to manage their caloric intake, so they are not taking in so many calories in an effort to lose fat. The reason no calories are listed on the Pre-Hype label is because there's less than 5 calories per serving, so if you're using that only then it won't break your fast.