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Pepsi’s latest refresher claims to fend off fat. But is a healthy soda an oxymoron?

“Pepsi Special,” the new drink distributed by Pepsi’s partner in Japan, Suntory Holdings Limited, contains dextrin, a dietary fiber that dissolves in water and is found in fiber supplements such as Benefiber. Eaten appropriately, in fiber-rich foods such as vegetables and fruits, fiber helps to regulate the digestive system, lower cholesterol and may lower the risk of heart disease.