Yogurt is a custard-like food made from milk that may have its origins in Turkey. By introducing beneficial bacteria to the milk, the liquid becomes curdled as the minute organisms ingest sugars and release lactic acid. If the bacteria are not killed after the fermentation process, the yogurt is sold containing live active cultures, which some believe to provide a variety of health benefits. Commercially made yogurt often contains fruit, the sweetness of which helps offset the characteristic sour taste of yogurt. When frozen yogurt became popular in the United States during the 1990s, many of the varieties offered, such as the strawberry banana version produced by Ben & Jerry’s, also contained fruit. Contributing to the great success of frozen yogurts over the last decade is its wide availability in low-fat and fat-free forms.