Normal glucose test. Can eating lots of sugar (cookies) and carbs in 3 days reverse normalcy and cause gestational diabetes? 108 glucose 19.6 BMI 25w

Short-term sugar OK. Secondary forms of diabetes (not the autoimmune insulin-requiring types), including the gestational type, are caused by cells become desensitized to insulin. This happens when Insulin levels are always high due to high sugar intake. It takes time; pregnancy just adds to the process. Three days of cake or girl scout cookies won't do anything if you weren't already heading that way.