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More than half of the $2.2 trillion spent annually on healthcare in the U.S. could be considered wasteful, according to an analysis published by PricewaterhouseCoopers’ Health Research Institute. Defensive medicine, such as redundant, inappropriate or unnecessary tests and procedures, was identified as the biggest area of excess, followed by inefficient healthcare administration and the cost of care necessitated by conditions such as obesity, which can be considered preventable by lifestyle changes.