Why does Greek yogurt have sugar in it? Understanding Lactose vs. Added Sweeteners
                                
                                
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                                    4 min read                                
                            
                                According to Healthline, plain Greek yogurt contains naturally occurring sugar from milk called lactose. This fact surprises many consumers who question, 'Why does Greek yogurt have sugar in it,' when it tastes so tart? The presence of sugar is due to a two-part answer: the natural sugars in milk and the added sweeteners that manufacturers include to alter the flavor profile.