Definition of "wreak havoc" []

• To cause damage, disruption, or destruction. (verb)

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• "They do know, however, that when regulatory T cells lack a proper education, or when regulatory T cells are not formed in sufficient quantity in the thymus, antigen-seeking T cells can be suddenly freed to wreak havoc in the body, turning on both foreign antigens and body tissue at will, with nothing to tell them to stop."
• "High-glycemic-index foods will cause you to have higher peaks in blood sugar and can wreak havoc on your insulin regulation."
• "Erupting inflation and drastic devaluations can wreak havoc on business plans and operations."