The Worst No. 1: Acesulfame K This sugar substitute has been approved since 1988, but you probably didn't know it's being used in your favorite foods and drinks (think ice cream and fruit juice), as well as personal care products, such as toothpaste and mouthwash. Look for it in ingredient lists as acesulfame K, acesulfame potassium, Ace-K or Sunett. According to celebrity nutritionist Lisa DeFazio, MS, RD, acesulfame K contains the carcinogen methylene chloride. "Long-term exposure can cause headaches, depression, nausea, mental confusion and even cancer," she says.
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